CN101131809B - Liquid crystal display device and method for transmitting gamma voltage signal - Google Patents
- ️Wed Apr 13 2011
CN101131809B - Liquid crystal display device and method for transmitting gamma voltage signal - Google Patents
Liquid crystal display device and method for transmitting gamma voltage signal Download PDFInfo
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Publication number
- CN101131809B CN101131809B CN2007101619432A CN200710161943A CN101131809B CN 101131809 B CN101131809 B CN 101131809B CN 2007101619432 A CN2007101619432 A CN 2007101619432A CN 200710161943 A CN200710161943 A CN 200710161943A CN 101131809 B CN101131809 B CN 101131809B Authority
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- China Prior art keywords
- signal
- digital
- gamma voltage
- source driving
- digital signal Prior art date
- 2007-09-26 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 10
- 239000004020 conductor Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A method for transmitting gamma voltage signals comprises transmitting digital signals to a plurality of source driving chips connected in series, wherein the digital signals comprise a plurality of digital gamma voltage generation signals which respectively correspond to one of the source driving chips; each source driving chip captures a digital gamma voltage generation signal corresponding to the source driving chip from the digital signal; each source driving chip generates a gamma voltage signal according to the digital gamma voltage generation signal; wherein the step of generating the gamma voltage signal further comprises: amplifying the digital gamma voltage generating signal to obtain a high voltage digital signal; and converting the high voltage digital signal into a gamma voltage signal. A liquid crystal display device is also disclosed. The liquid crystal display device and the method for transmitting the gamma voltage signals can solve the problem that the voltage value of the gamma voltage is reduced due to the influence of line impedance in the transmission process, so that the accuracy of the gamma voltage cannot be influenced even if the gamma voltage is transmitted for a long distance.
Description
Technical field
The invention relates to the method for a kind of liquid crystal indicator and transmission gamma voltage signal, and particularly relevant for a kind of liquid crystal indicator and method of utilizing the tandem transmission interface to transmit gamma voltage signal.
Background technology
In conventional liquid crystal, source driving chip all is to receive the signal that time schedule controller sent by flexible circuit board, therefore needs to use flexible circuit board to be used as the media that signal transmits.In order to reduce the use of flexible circuit board, the someone proposes to use the design of source driving chip serial connection.Fig. 1 illustrates the synoptic diagram of the panel wiring of general use source driving chip serial connection.As shown in the figure, two chip for driving 100 are serially connected mutually, in order to the transmission of signal.Fig. 2 illustrates the enlarged diagram of the chip for driving of two serial connections among Fig. 1.As shown in the figure, two chip for driving 100 are connected in series mutually by the panel wiring, the transmission of data between chip and chip reached in wiring on panel, make signal can be orderly sent in the source driving chip of each serial connection, wherein the signal that is transmitted comprises control signal, RGB (RGB) chrominance signal and gamma voltage (gamma voltage) etc.Utilizing the mode of this kind serial connection to transmit signal can directly deliver to required signal in each source driving chip in regular turn, does not need to transmit signals in each source driving chip by flexible circuit board individually again, therefore can save manufacturing cost.
For the design of source driving chip serial connection, generally be to utilize film wire on the panel to transmit the gamma voltage of tool fixed voltage value, promptly gamma voltage is to adopt the transmission mode of simulating signal to transmit.Yet, because gamma voltage can suffer the influence of the impedance of film wire when transmitting, and the problem of dtmf distortion DTMF that when transmitting, may take place, can't be so can cause gamma voltage voltage in transmittance process to descend as expectedly accurate.Gamma voltage is the voltage reference signal that belongs to important, so if having any variation in the process of transmitting, then may directly influence the correctness of data-signal output.
Therefore, need a kind of method that transmits gamma voltage, make gamma voltage correctly to be sent in each source driving chip for use.
Summary of the invention
The invention relates to the method for a kind of liquid crystal indicator and transmission gamma voltage signal, can correctly transmit gamma voltage signal for use.
A technical scheme of the present invention is about transmitting the method for gamma voltage signal in a kind of liquid crystal indicator, the method comprises: transmit the source driving chip of a digital signal to a plurality of serial connections, wherein said digital signal comprises a plurality of digital gamma voltages and produces signals, described these digital gamma voltages produce signals correspond to separately described these source driving chips one of them; Each described these source driving chip captures its pairing described digital gamma voltage and produces signal in described digital signal; And each described these source driving chip produces a gamma voltage signal according to described digital gamma voltage generation signal; The step that wherein produces described gamma voltage signal comprises in addition: described digital gamma voltage is produced signal amplify, to obtain a high voltage digital signal; Described high voltage digital signal is converted to described gamma voltage signal; Described high voltage digital signal is by a level regulator circuit described digital gamma voltage to be produced signal to amplify and get; Described gamma voltage signal is by a digital analog converter described high voltage digital signal conversion to be got.
Another technical scheme of the present invention is about a kind of liquid crystal indicator, and this liquid crystal indicator comprises the source driving chip of tandem transmission interface and a plurality of serial connections.The tandem transmission interface is in order to transmit digital signal, and wherein digital signal comprises a plurality of digital gamma voltages generation signals.Each source driving chip is receiving digital signals respectively, and comprises working storage module, level regulator circuit and D/A conversion circuit.The working storage module produces signal in order to the corresponding digital gamma voltage of acquisition in digital signal.Level regulator circuit is in order to amplify the digital gamma voltage generation signal that the working storage module is captured, with the output HIGH voltage digital signal.D/A conversion circuit then can be converted to gamma voltage signal with the high voltage digital signal that level regulator circuit is exported.
According to technology contents of the present invention, the method of application of aforementioned liquid crystal indicator and transmission gamma voltage signal thereof, can solve the problem that gamma voltage causes magnitude of voltage to descend because of the line impedance influence in transport process, even make gamma voltage also can not influence its accuracy by the transmission of long distance.Simultaneously, mode with digital signal is transmitted gamma voltage, also can dwindle wiring width required on the panel, and required signal can be combined with digital mode, so as to reducing the required number of conductors of transmission gamma voltage, the wiring space of saving panel effectively.
Description of drawings
Fig. 1 illustrates the synoptic diagram of the panel wiring of general use source driving chip serial connection.
Fig. 2 illustrates the enlarged diagram of the chip for driving of two serial connections among Fig. 1.
Fig. 3 illustrates the present invention transmits the liquid crystal indicator embodiment of gamma voltage by the tandem transmission interface circuit box synoptic diagram.
Fig. 4 illustrates the synoptic diagram of D/A conversion circuit among Fig. 3.
Fig. 5 illustrates the process flow diagram that transmits the method embodiment of gamma voltage signal in the liquid crystal indicator of the present invention.
Drawing reference numeral
100: chip for driving 300: the tandem transmission interface
302: working storage module 304: level regulator circuit
306: D/A conversion circuit 310: source driving chip
320: liquid crystal indicator 400: amplifier circuit unit
402:
operational amplifier500～506: step
Embodiment
Fig. 3 is for illustrating the circuit box synoptic diagram that transmits the liquid crystal indicator of gamma voltage by the tandem transmission interface according to embodiments of the invention.The
source driving chip310 that comprises
tandem transmission interface300 and a plurality of serial connections in the
liquid crystal indicator320, wherein
tandem transmission interface300 can be the tandem peripheral interface (serial peripheral interface, SPI) or internal integrate circuit bus (inter integrated circuits bus).
In
liquid crystal indicator320, control circuit (not illustrating) is sent to digital controlled signal in each
source driving chip310 that is connected in series on the panel by
tandem transmission interface300, wherein comprises a plurality of digital gamma voltages in the digital controlled signal and produces signal.Each
source driving chip310 receives respectively by
tandem transmission interface300 and transmits and next digital controlled signal.
Source driving chip310 comprises working storage module (register bank) 302, level regulator circuit (level shifter) 304 and D/A conversion circuit (digital-to-analog circuit, DAC) 306.
Working storage module302 produces signal in order to the corresponding digital gamma voltage of acquisition in digital controlled signal, for the required gamma voltage of each
source driving chip310 output of serial connection.
Level regulator circuit304 is in order to amplify the digital gamma voltage generation signal that
working storage module302 is captured, with the output HIGH voltage digital signal.306 of D/A conversion circuits are to be converted to the required gamma voltage of each
source driving chip310 in order to the high voltage digital signal that
level regulator circuit304 is exported.
Fig. 4 illustrates the synoptic diagram of D/A conversion circuit among Fig. 3.D/
A conversion circuit306 comprise n resistance R parallel with one another, 2R ..., 2 N-1R and
amplifier circuit unit400, wherein n is a positive integer, R be on the occasion of.With the present embodiment is example, and high voltage digital signal comprises n position signal, wherein this n signal respectively with V1, V2 ..., Vn represents, and be sent to resistance R respectively, 2R ..., 2 N-1R is so as to producing an electric current I.400 of amplifier circuit units are to comprise a feedback resistance R and an
operational amplifier402, and wherein an input end of
operational amplifier402 is electrically coupled to the end of feedback resistance R, and in order to received current I; And another input end grounding (grounded) of
operational amplifier402; The output terminal of
operational amplifier402 then is the other end that is electrically coupled to feedback resistance R, with output gamma voltage G.
With the present embodiment is example, when high voltage digital signal is 00 ... 01 o'clock, position signal V1 was high levels state (supposing that its voltage is V), all the other signal V2 ... with Vn be low level state (supposing that its voltage is 0).At this moment, according to position signal V1, V2 ... electric current I=the V/R that is produced with Vn, and electric current I is after receiving by
amplifier circuit unit400, gamma voltage G=(V/R) the * R=V that makes final output.Thus, just the mode of gamma voltage with digital signal can be transmitted, in each source driving chip of serial connection, be converted into simulating signal more afterwards, avoid in transport process, suffering the consume of voltage.
Fig. 5 illustrates the process flow diagram that transmits the method embodiment of gamma voltage signal in the liquid crystal indicator of the present invention.At first, the digital controlled signal that control circuit transmitted is passed to by the tandem transmission interface in the source driving chip of a plurality of serial connections on the panel (step 500), wherein the tandem transmission interface can be the tandem peripheral interface (serial peripheral interface, SPI) or internal integrate circuit bus (inter integrated circuits bus).In addition, the digital controlled signal that is transmitted by the tandem transmission interface comprises a plurality of digital gamma voltages generation signals, and each digital gamma voltage generation signal corresponds to one source pole chip for driving wherein separately.
Then, each source driving chip captures its correspondence in received digital controlled signal digital gamma voltage produces signal (step 502), and wherein digital gamma voltage produces signal and can get by working storage module acquisition.Then, the digital gamma voltage that is captured is produced signal amplify, to obtain high voltage digital signal (step 504), wherein high voltage digital signal can produce signal with digital gamma voltage by level regulator circuit and amplifies and get.At last, high voltage digital signal is converted to gamma voltage signal (step 506), wherein gamma voltage signal can get the high voltage digital signal conversion by digital analog converter again.Thus, just the mode of gamma voltage with digital signal can be transmitted, avoid the consume of voltage in the transport process.Then, be converted into the form of required simulating signal again, reach the purpose that transmits gamma voltage exactly.
By the embodiment of the invention described above as can be known, the method of application of aforementioned liquid crystal indicator and transmission gamma voltage signal thereof, can solve the problem that gamma voltage causes magnitude of voltage to descend because of the line impedance influence in transport process, even also can not influence its accuracy at the transmittance process of long distance.Simultaneously, transmit gamma voltage, also can dwindle wiring width required on the panel, and required signal can be combined with digital mode,, save wiring space effectively so as to reducing the required number of conductors of transmission gamma voltage in the mode of digital signal.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; any have a technical field of the invention know the knowledgeable usually; without departing from the spirit and scope of the present invention; can be used for a variety of modifications and variations, so protection scope of the present invention is worked as with being as the criterion that claim was defined.
Claims (6)
1. transmit the method for gamma voltage signal in the liquid crystal indicator, described method comprises:
Transmit the source driving chip of a digital signal to a plurality of serial connections, wherein said digital signal comprises a plurality of digital gamma voltages and produces signals, described these digital gamma voltages produce signals correspond to separately described these source driving chips one of them;
Each described these source driving chip captures its pairing described digital gamma voltage and produces signal in described digital signal; And
Each described these source driving chip produces signal according to described digital gamma voltage and produces a gamma voltage signal;
The step that wherein produces described gamma voltage signal comprises in addition: described digital gamma voltage is produced signal amplify, to obtain a high voltage digital signal; And described high voltage digital signal is converted to described gamma voltage signal;
Described high voltage digital signal is by a level regulator circuit described digital gamma voltage to be produced signal to amplify and get;
Described gamma voltage signal is by a digital analog converter described high voltage digital signal conversion to be got.
2. the method for claim 1, wherein said digital signal system is sent in the more described source driving chip by the tandem transmission interface.
3. method as claimed in claim 2, wherein said tandem transmission interface are a tandem peripheral interface or an internal integrate circuit bus.
4. it is by working storage module acquisition and get that the method for claim 1, wherein said digital gamma voltage produce signal.
5. liquid crystal indicator, described device comprises:
A string biographies are failed interface, and in order to transmit a digital signal, wherein said digital signal comprises a plurality of digital gamma voltages and produces signal; And
The source driving chip of a plurality of serial connections, wherein each described these source driving chip receives described digital signal respectively, and comprises:
One working storage module produces signal in order to the corresponding described digital gamma voltage of acquisition in described digital signal;
One level regulator circuit is in order to amplify the described digital gamma voltage generation signal that described working storage module is captured, to export a high voltage digital signal; And
One D/A conversion circuit is converted to a gamma voltage signal in order to the described high voltage digital signal that described level regulator circuit is exported.
6. liquid crystal indicator as claimed in claim 5, wherein said tandem transmission interface are a tandem peripheral interface or an internal integrate circuit bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101619432A CN101131809B (en) | 2007-09-26 | 2007-09-26 | Liquid crystal display device and method for transmitting gamma voltage signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101619432A CN101131809B (en) | 2007-09-26 | 2007-09-26 | Liquid crystal display device and method for transmitting gamma voltage signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101131809A CN101131809A (en) | 2008-02-27 |
| CN101131809B true CN101131809B (en) | 2011-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101619432A Expired - Fee Related CN101131809B (en) | 2007-09-26 | 2007-09-26 | Liquid crystal display device and method for transmitting gamma voltage signal |
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Families Citing this family (5)
* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615909B (en) * | 2008-06-26 | 2012-06-20 | 奇景光电股份有限公司 | Decoder with pre-decoding function and source driver circuit with compact layout |
| CN102956173A (en) * | 2011-08-17 | 2013-03-06 | 联咏科技股份有限公司 | Display driving device and driving method thereof |
| CN104978935B (en) * | 2014-04-02 | 2018-03-27 | 奇景光电股份有限公司 | Source driver and display panel using the source driver |
| CN104347047B (en) * | 2014-11-11 | 2016-09-07 | 深圳市华星光电技术有限公司 | Array base palte, display device and driving method thereof |
| CN115953971A (en) * | 2022-12-29 | 2023-04-11 | Tcl华星光电技术有限公司 | Display device and electronic apparatus |
Citations (1)
* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1623114A (en) * | 2002-03-11 | 2005-06-01 | 三星电子株式会社 | Liquid crystal display for improving dynamic contrast and method for generating gamma voltages for the liquid crystal display |
-
2007
- 2007-09-26 CN CN2007101619432A patent/CN101131809B/en not_active Expired - Fee Related
Patent Citations (1)
* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1623114A (en) * | 2002-03-11 | 2005-06-01 | 三星电子株式会社 | Liquid crystal display for improving dynamic contrast and method for generating gamma voltages for the liquid crystal display |
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| CN101131809A (en) | 2008-02-27 |
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| Date | Code | Title | Description |
|---|---|---|---|
| 2008-02-27 | C06 | Publication | |
| 2008-02-27 | PB01 | Publication | |
| 2008-04-23 | C10 | Entry into substantive examination | |
| 2008-04-23 | SE01 | Entry into force of request for substantive examination | |
| 2011-04-13 | C14 | Grant of patent or utility model | |
| 2011-04-13 | GR01 | Patent grant | |
| 2021-09-03 | CF01 | Termination of patent right due to non-payment of annual fee | |
| 2021-09-03 | CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110413 Termination date: 20200926 |