CN1937025A - Grey-to-grey voltage generating circuit for plane display and operation method - Google Patents
Grey-to-grey voltage generating circuit for plane display and operation method Download PDFInfo
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- CN1937025A CN1937025A CN 200510103771 CN200510103771A CN1937025A CN 1937025 A CN1937025 A CN 1937025A CN 200510103771 CN200510103771 CN 200510103771 CN 200510103771 A CN200510103771 A CN 200510103771A CN 1937025 A CN1937025 A CN 1937025A
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Abstract
Being in use for panel display, the circuit for generating gray scale voltages includes at least a divider circuit, first voltage end, second voltage end and switch. Being connected to divider circuit electrically, the first voltage end is in use for inputting first reference voltage. Being connected to divider circuit electrically, the second voltage end is in use for inputting second reference voltage. Including at least a resistance, the divider circuit is in use for generating multiple voltage divisions, and outputting multiple gray scale voltages. The switch is in use for controlling on/off of the gray scale voltage generation circuit.
Description
Technical field
The invention relates to a kind of GTG (Gray Scale) voltage generation circuit, and particularly relevant for a kind of gray scale voltage generation circuit that is applicable to flat-panel screens.
Background technology
There is many flat-panel screens (Flat Panel Display) technology to be developed in succession in recent years, wherein, LCD (LCD) because have that high image quality, volume are little, in light weight, advantages such as low voltage drive, low power consumption and applied range, therefore be widely used in medium and small Portable TV, mobile phone, shoot with video-corder consumer electronics or computer products such as projector, notebook computer, desktop display and projection TV, and replace cathode-ray tube (CRT) (Cathode Ray Tube gradually; CRT), become the main flow of following display, wherein thin film transistor (TFT) (Thin Film Transistor particularly; TFT) LCD because of the characteristic of its high display quality and low consumpting power, has almost occupied most market.
Thin Film Transistor-LCD is by applying the pixel of suitable gray scale voltage on panel, uses the angle that changes the pixel liquid crystal molecule, and then changes the transmittance of panel, and reaches the GTG that institute's desire shows.Yet, because of the video picture mode of LCD is freeze mode (Hold-type) video picture mode, with traditional cathode-ray tube (CRT) (Cathode Radiation Tube; CRT) therefore the pulsed of display (Impulse-type) video picture mode difference, when the video picture mode of using freeze mode shows dynamic image, will produce smear (Blurring) phenomenon to the human visual system.Known solution is the Push And Release with the switching backlight module at present, or by the black picture signal of system end input, to insert the method for black picture, solves above-mentioned problem.Yet it is more high-power that the Push And Release that constantly switches backlight module will cause backlight module to expend, if the signal of specially sending black picture by system end needs extra control signal, will increase the complexity of system end line design.
In addition, open the moment of (Turn On) in LCD, the data-signal that this moment is correct for example can be low-voltage differential signal (Low Voltage Differential Signal; LVDS), do not input to data drive circuit (Data Driver) as yet, but this moment, data drive circuit can be because of last time showing or other factors, make its inside have remaining data current potential, be called original state (Initial State), existing side by side is about to this residual data current potential output, moreover a different data drive circuit can be exported different signals according to its different original state.Although this moment, fluorescent tube was not lighted as yet, but still indistinctly can on picture, see banded noise.Please refer to the 1st figure, the 1st figure is the synoptic diagram that concerns of the input voltage, system signal and the fluorescent tube that illustrate known Thin Film Transistor-LCD.Shown in the 1st figure, input to panel and system signal inputs between the panel at voltage vcc, the mistiming of t2 is still arranged, and the data drive circuit of this moment just can be according to its different original state voltage, export different voltage levels, and then cause LCD banded noise to occur.
Summary of the invention
Therefore, purpose of the present invention is exactly that a kind of gray scale voltage generation circuit that is used for flat-panel screens is being provided, and need not switch the Push And Release of backlight module, promptly exportable black picture.
Another object of the present invention is that a kind of gray scale voltage generation circuit that is used for flat-panel screens is being provided, and does not need system end specially to send the signal of black picture, promptly exportable black picture.
Another purpose of the present invention is that a kind of gray scale voltage generation circuit that is used for flat-panel screens is being provided, the banded noise that produces on display picture in the time of can avoiding system's power supply.
According to above-mentioned purpose of the present invention, a kind of gray scale voltage generation circuit that is used for flat-panel screens is proposed, comprise at least one bleeder circuit, one first voltage end, one second voltage end and a switch at least.First voltage end and bleeder circuit electrically connect, and are used to import first reference voltage.Second voltage end and bleeder circuit electrically connect, and are used to import second reference voltage.Bleeder circuit comprises resistance at least, is used to produce a plurality of dividing potential drops, exports a plurality of gray scale voltages.Switch is used to control the Push And Release of gray scale voltage generation circuit.
According to embodiments of the invention, above-mentioned switch is if between the bleeder circuit and first voltage end, and if this switch is for opening circuit, then a plurality of gray scale voltages of bleeder circuit output are equal to second reference voltage.If above-mentioned switch is between the bleeder circuit and second voltage end, and if this switch is for opening circuit, then a plurality of gray scale voltages of bleeder circuit output are equal to first reference voltage.If above-mentioned switch is between bleeder circuit, and if this switch is for opening circuit, then a plurality of gray scale voltages of the bleeder circuit of part output are first reference voltage, a plurality of gray scale voltages of the bleeder circuit output of remainder are second reference voltage.Above-mentioned switch can be N type metal oxide semiconductor transistor or P-type mos transistor.
According to above-mentioned purpose of the present invention, a kind of gray scale voltage generation circuit that is used for flat-panel screens is proposed, at least comprise: a plurality of first bleeder circuits, those first bleeder circuits are to electrically connect reference voltage, and each those first bleeder circuit comprises first resistance; A plurality of second bleeder circuits, those second bleeder circuits are to electrically connect ground voltage, and each those second bleeder circuit comprises second resistance; And switch, be electrically connected between those first bleeder circuits and those second bleeder circuits.
According to purpose of the present invention, a kind of method of operating that is used for the gray scale voltage generation circuit of flat-panel screens is proposed.Wherein, gray scale voltage generation circuit comprises a bleeder circuit, one first voltage end, one second voltage end and a switch at least.First voltage end provides first reference voltage, and second voltage end provides second reference voltage.The method of operating of this gray scale voltage generation circuit comprises the following steps at least.At first, in Preset Time, with above-mentioned switch keeping at off state.Then, provide system voltage to flat-panel screens, provide system signal to flat-panel screens in second time point again in very first time point.Then, export first group of a plurality of gray scale voltage by bleeder circuit.Next, switch is switched to conducting state, then, export second group of a plurality of gray scale voltage by bleeder circuit.
According to embodiments of the invention, between the bleeder circuit and second voltage end, then first group of a plurality of gray scale voltage is equal to first reference voltage as if above-mentioned switch.If above-mentioned switch is between the bleeder circuit and first voltage end, then first group of a plurality of gray scale voltage is equal to second reference voltage.If above-mentioned switch is between bleeder circuit, then Bu Fen first group of a plurality of gray scale voltage are first reference voltage, and first group of a plurality of gray scale voltage of remainder are second reference voltage.Above-mentioned Preset Time greater than provide system voltage to LCD with the mistiming of system signal to LCD be provided.
According to above-mentioned purpose of the present invention, a kind of method of operating that is used for the gray scale voltage generation circuit of flat-panel screens is proposed, wherein this gray scale voltage generation circuit comprises a plurality of first bleeder circuits, a plurality of second bleeder circuit and a switch at least, those first bleeder circuits are to electrically connect reference voltage, those second bleeder circuits are to electrically connect ground voltage, this switch is electrically connected between those first bleeder circuits and those second bleeder circuits, and the method for operating that this gamma electric voltage produces circuit comprises at least: make this switch keeping conducting state; Those first bleeder circuits and each those second bleeder circuit are exported gamma electric voltage respectively by each, make this liquid crystal display displays normal pictures; This switch is switched to off state; And by each those first bleeder circuits are exported this reference voltage, and those second bleeder circuits are exported this ground voltage by each, make this liquid crystal display displays deceive picture.
Description of drawings
The 1st figure is the synoptic diagram that concerns of the input voltage, system signal and the fluorescent tube that illustrate known Thin Film Transistor-LCD.
The 2nd figure is the gray scale voltage generation circuit synoptic diagram that illustrates according to first embodiment of the invention.
The 3rd figure is the gray scale voltage generation circuit synoptic diagram that illustrates according to second embodiment of the invention.
The 4th figure is the gray scale voltage generation circuit synoptic diagram that illustrates according to third embodiment of the invention.
The 5th figure is that the black picture that gray scale voltage generation circuit produced that illustrates according to present embodiment inserts functional schematic.
[main element label declaration]
200: gray scale voltage generation circuit 202: switch
204: input end 206: earth terminal
208: bleeder circuit 300: gray scale voltage generation circuit
302: switch 304: input end
306: earth terminal 308: bleeder circuit
400: gray scale voltage generation circuit 402: switch
404: input end 406: earth terminal
428: the second bleeder circuits of 418: the first bleeder circuits
502: picture frame 504: picture frame
506: picture frame 508: picture frame
510: picture frame
Embodiment
The present invention discloses a kind of gray scale voltage generation circuit that is used for flat-panel screens, with the smear problem of solution Thin Film Transistor-LCD and the banded noise of system's power supply moment generation.In order to make narration of the present invention more detailed and complete, can and cooperate the diagram of the 2nd figure to the 5 figure with reference to the description of the following example.
First embodiment:
Please refer to the 2nd figure, the 2nd figure is the gray scale voltage generation circuit synoptic diagram that illustrates according to first embodiment of the invention.The gray scale voltage generation circuit 200 of present embodiment comprises input end 204, earth terminal 206, bleeder circuit 208 and switch 202.Input end 204 is used for input reference voltage (V
Ref); Earth terminal 206 is used for input grounding voltage (Ground Voltage); Bleeder circuit 208 is electrically connected between input end 204 and the earth terminal 206, and bleeder circuit 208 comprises 10 resistance, and (R1～R10) is used for branch and extrudes 10 gray scale voltages (GMA1～GMA10); Switch 202 is electrically connected between bleeder circuit 208 and the earth terminal 206, with the short circuit of gauge tap 202 or open circuit, and then makes that gray scale voltage generation circuit is normal partial pressure or suspension joint (Floating) state by outside input RESET-N signal.When switch 202 conductings, the GTG resistance string can be received ground, and (GMA1～GMA10) can output in the data drive circuit (not illustrating) provides the voltage of corresponding image gray-scale level value to 10 groups of different gray scale voltages at this moment.And when switch 202 not conductings (being off state), the GTG resistance string can be floating, this moment 10 groups of gray scale voltages (GMA1～GMA10) is equal to reference voltage (V
Ref), therefore, no matter the image gray-scale level value of data drive circuit institute desire output is why, the corresponding voltage of exporting of its institute is reference voltage.Above-mentioned switch 202 for example can be N type metal oxide semiconductor transistor (NMOS), P-type mos transistor (PMOS) or other can be used as the element of switch.
Shown in the 2nd figure, the switch 202 of present embodiment is to use N type metal oxide semiconductor transistor, and uses the RESET-N signal whether to control the transistorized conducting of this N type metal oxide semiconductor.In the present embodiment, because banded noise system occurs in voltage vcc and inputs to the mistiming interior (that is the t2 among the 1st figure) that panel and system signal input to panel, therefore, if after voltage vcc inputs to panel in about 60ms (t2＜60), all RESET-N is controlled at the state of low-voltage (Low), then Ci Shi not conducting of N type metal oxide semiconductor transistor, switch 202 is for opening circuit, the GTG resistance string all can be the state of suspending, and the level of 10 groups of gray scale voltages is equal to reference voltage, so, during this period of time, even if data drive circuit can be exported different signal according to its original state difference, but because each group gray scale voltage of its reception all is a reference voltage, therefore, after digital analog converter (DAC) decoding is come out, different data drive circuit still can be exported identical voltage to display.
Afterwards, RESET-N is reverted to the state of high voltage (High), then Ci Shi switch 202 will conducting again, and the GTG resistance string can be received ground, and 10 groups of different gray scale voltages just can output in the data drive circuit, make data drive circuit begin enabling.Thus, the banded noise that on display picture, produces in the time of just can avoiding system's power supply.In addition, the time that switch 202 cuts out not is only to be limited to 60ms as long as input to the mistiming (t2) that panel and system signal input to panel greater than voltage vcc.
Second embodiment:
Then, please refer to the 3rd figure, the 3rd figure is the gray scale voltage generation circuit synoptic diagram that illustrates according to second embodiment of the invention.The structural similarity of the present embodiment and first embodiment, only the gray scale voltage generation circuit 300 of present embodiment is to add a switch 302 between bleeder circuit 308 and input end 304.If switch 302 not conductings during t=0 to t=60ms, then this moment 10 groups of gray scale voltages (GMA1～GMA10) is equal to ground connection, therefore, even data drive circuit can be exported different signal according to its original state difference, but the output voltage after digital analog converter decodes out all can be 0V.And when t＞60ms, switch 302 conductings, 10 groups of different gray scale voltages of bleeder circuit 308 outputs, data drive circuit enabling.Therefore, the Improvement type gray scale voltage generation circuit of present embodiment also can solve the problem of banded noise.Similarly, above-mentioned switch 302 for example can be N type metal oxide semiconductor transistor, P-type mos transistor or other can be used as the element of switch.The time that switch 302 cuts out not is only to be limited to 60ms as long as input to the mistiming that panel and system signal input to panel greater than voltage vcc.
The 3rd embodiment:
Next, please refer to the 4th figure, the 4th figure is the gray scale voltage generation circuit synoptic diagram that illustrates according to third embodiment of the invention.The gray scale voltage generation circuit 400 of present embodiment comprises input end 404, earth terminal 406, first bleeder circuit 418, second bleeder circuit 428 and switch 402.Input end 404 is used for input reference voltage (V
Ref); Earth terminal 406 is used for input grounding voltage (Ground voltage); First bleeder circuit 418 is electrically connected at input end 404, and first bleeder circuit 418 comprises 5 resistance, and (R1～R5) is used for branch and extrudes first group of gray scale voltage (GMA1～GMA5); Second bleeder circuit 428 is electrically connected at earth terminal 406, and second bleeder circuit 428 comprises 5 resistance, and (R6～R11) is used for branch and extrudes second group of gray scale voltage (GMA6～GMA10); Switch 402 is electrically connected between first bleeder circuit 418 and second bleeder circuit 428, is used to control gray scale voltage generation circuit 400 and is normal partial pressure or floating.If gauge tap 402 is for opening circuit, then (GMA1～GMA5) is equal to reference voltage (V to first group of gray scale voltage that this moment first, bleeder circuit 418 was exported
Ref), (GMA6～GMA10) is equal to ground voltage (Ground Voltage) to second group of gray scale voltage of second bleeder circuit, 428 outputs simultaneously; If gauge tap 402 is short circuit, the different first group of gray scale voltage of first bleeder circuit, 418 outputs this moment (GMA1～GMA5), the different second group of gray scale voltage of second bleeder circuit, 428 outputs simultaneously (GMA6～GMA10) then.
Please refer to the 5th figure, the 5th figure illustrates the black picture that the gray scale voltage generation circuit 400 according to present embodiment produced to insert functional schematic.When switch 402 conductings, 10 groups of gray scale voltage meeting normal partial pressure, data line drive circuit meeting normal running this moment, picture can show as the picture frame of the 5th figure (Frame) 502, picture frame 506 and the normal pictures shown in the picture frame 510.And when switch 402 not conductings, gray scale voltage generation circuit 400 is a floating, (GMA1～GMA5) is equal to reference voltage to first group of gray scale voltage of bleeder circuit 418 output this moment first, (GMA6～GMA10) is equal to ground voltage to second group of gray scale voltage of second bleeder circuit, 428 outputs simultaneously, wherein, the black picture of reference voltage representing positive polarity, the black picture of ground voltage representing negative polarity, therefore, the picture of LCD can present the picture frame 504 and the black picture shown in the picture frame 508 as the 5th figure.In an embodiment of the present invention, the conducting that only needs to come gauge tap 402 by signal of sequential control circuit output whether, just the picture of may command display is output as normal pictures or black picture.Above-mentioned switch 402 for example can be N type metal oxide semiconductor transistor, P-type mos transistor or other can be used as the element of switch.
By the embodiment of the invention described above as can be known, an advantage of the present invention is exactly can be by the switch in the control gray scale voltage generation circuit, make gray scale voltage temporarily keep fixed value, to solve the banded noise of Thin Film Transistor-LCD in system's power supply moment generation.
By the embodiment of the invention described above as can be known, another advantage of the present invention is exactly to utilize the switch in the gray scale voltage generation circuit to produce black picture, do not need the system signal of the black picture of extra input, or switch the Push And Release of backlight module, just can solve the smear problem of Thin Film Transistor-LCD.
Though the present invention discloses as above with preferred embodiment; so it is not to be used to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (14)
1. gray scale voltage generation circuit that is used for flat-panel screens comprises at least:
First voltage end is used to import first reference voltage;
Second voltage end is used to import second reference voltage;
At least one bleeder circuit is electrically connected between this first voltage end and this second voltage end, is used to produce a plurality of dividing potential drops; And
Switch is used to control the Push And Release of this gray scale voltage generation circuit.
2. the gray scale voltage generation circuit that is used for flat-panel screens according to claim 1, wherein this switch between this bleeder circuit and this first voltage end, and if this switch for opening circuit, then those dividing potential drops equal this second reference voltage.
3. the gray scale voltage generation circuit that is used for flat-panel screens according to claim 1, wherein this switch between this bleeder circuit and this second voltage end, and if this switch for opening circuit, then those dividing potential drops equal this first reference voltage.
4. the gray scale voltage generation circuit that is used for flat-panel screens according to claim 1, wherein this switch is positioned at this bleeder circuit, and if this switch is for opening circuit, then Bu Fen those dividing potential drops equal this first reference voltage, and those dividing potential drops of remainder equal this second reference voltage.
5. the gray scale voltage generation circuit that is used for flat-panel screens according to claim 1, wherein this switch is N type metal oxide semiconductor transistor or P-type mos transistor.
6. gray scale voltage generation circuit that is used for flat-panel screens comprises at least:
A plurality of first bleeder circuits, those first bleeder circuits are to electrically connect reference voltage, and each those first bleeder circuit comprises first resistance;
A plurality of second bleeder circuits, those second bleeder circuits are to electrically connect ground voltage, and each those second bleeder circuit comprises second resistance; And
Switch is electrically connected between those first bleeder circuits and those second bleeder circuits.
7. the gray scale voltage generation circuit that is used for flat-panel screens according to claim 6, if this switch off state wherein, then each those first bleeder circuit is exported this reference voltage, each those second bleeder circuit is exported this ground voltage.
8. the gray scale voltage generation circuit that is used for flat-panel screens according to claim 6, wherein this switch is N type metal oxide semiconductor transistor or P-type mos transistor.
9. method of operating that is used for the gray scale voltage generation circuit of flat-panel screens, wherein this gray scale voltage generation circuit comprises a bleeder circuit, one first voltage end, one second voltage end and a switch at least, this first voltage end provides first reference voltage, this second voltage end provides second reference voltage, and the method for operating of this gray scale voltage generation circuit comprises at least:
In Preset Time, with this switch keeping at off state;
Provide system voltage to this flat-panel screens in very first time point;
Provide system signal to this flat-panel screens in second time point;
Export this first reference voltage or this second reference voltage by this bleeder circuit;
This switch is switched to conducting state; And
Export a plurality of gray scale voltages by this bleeder circuit.
10. the method for operating that is used for the gray scale voltage generation circuit of flat-panel screens according to claim 9, wherein this switch is between this bleeder circuit and this second voltage end, and this first gamma electric voltage is this first reference voltage.
11. the method for operating that is used for the gray scale voltage generation circuit of flat-panel screens according to claim 9, wherein this switch is between those bleeder circuits and this first voltage end, and this first gamma electric voltage is this second reference voltage.
12. the method for operating that is used for the gray scale voltage generation circuit of flat-panel screens according to claim 9, wherein this Preset Time greater than provide this system voltage to this LCD with the mistiming of this system signal to this LCD be provided.
13. method of operating that is used for the gray scale voltage generation circuit of flat-panel screens, wherein this gray scale voltage generation circuit comprises a plurality of first bleeder circuits, a plurality of second bleeder circuit and a switch at least, those first bleeder circuits are to electrically connect reference voltage, those second bleeder circuits are to electrically connect ground voltage, this switch is electrically connected between those first bleeder circuits and those second bleeder circuits, and the method for operating that this gamma electric voltage produces circuit comprises at least:
Make this switch keeping conducting state;
Those first bleeder circuits and each those second bleeder circuit are exported gamma electric voltage respectively by each, make this liquid crystal display displays normal pictures;
This switch is switched to off state; And
Those first bleeder circuits are exported this reference voltage by each, and those second bleeder circuits are exported this ground voltage by each, make this liquid crystal display displays deceive picture.
14. the method for operating that is used for the gray scale voltage generation circuit of flat-panel screens according to claim 13 also comprises by the sequential control circuit output signal, to control the state of this switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101037714A CN1937025B (en) | 2005-09-23 | 2005-09-23 | Grey-to-grey voltage generating circuit for plane display and operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101037714A CN1937025B (en) | 2005-09-23 | 2005-09-23 | Grey-to-grey voltage generating circuit for plane display and operation method |
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| Publication Number | Publication Date |
|---|---|
| CN1937025A true CN1937025A (en) | 2007-03-28 |
| CN1937025B CN1937025B (en) | 2011-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005101037714A Active CN1937025B (en) | 2005-09-23 | 2005-09-23 | Grey-to-grey voltage generating circuit for plane display and operation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163673A (en) * | 2011-12-16 | 2013-06-19 | 泰勒斯公司 | Secure display device with twisted nematic liquid crystal matrix |
| CN108682403A (en) * | 2018-04-28 | 2018-10-19 | 昆山龙腾光电有限公司 | Gamma electric voltage switching device and liquid crystal display device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4108360B2 (en) * | 2002-04-25 | 2008-06-25 | シャープ株式会社 | Display drive device and display device using the same |
| JP2004325716A (en) * | 2003-04-24 | 2004-11-18 | Sharp Corp | Driving circuit for displaying color image and display device provided with the driving circuit |
| JP3955298B2 (en) * | 2003-12-25 | 2007-08-08 | 松下電器産業株式会社 | Resistive voltage dividing circuit, and liquid crystal driving device and liquid crystal display device using this resistive voltage dividing circuit |
-
2005
- 2005-09-23 CN CN2005101037714A patent/CN1937025B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163673A (en) * | 2011-12-16 | 2013-06-19 | 泰勒斯公司 | Secure display device with twisted nematic liquid crystal matrix |
| CN103163673B (en) * | 2011-12-16 | 2018-02-13 | 泰勒斯公司 | Secure display device with twisted nematic liquid crystal matrix |
| CN108682403A (en) * | 2018-04-28 | 2018-10-19 | 昆山龙腾光电有限公司 | Gamma electric voltage switching device and liquid crystal display device |
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| Publication number | Publication date |
|---|---|
| CN1937025B (en) | 2011-11-23 |
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Effective date of registration: 20110921 Address after: Miaoli County, Taiwan, China Applicant after: Chimei Optoelectronics Co., Ltd. Address before: Tainan County, Taiwan, China Applicant before: Chimei Optoelectronics Co., Ltd. |
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