CN202075969U - Source driver and LCD employing same - Google Patents
Source driver and LCD employing same Download PDFInfo
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- CN202075969U CN202075969U CN2011202015766U CN201120201576U CN202075969U CN 202075969 U CN202075969 U CN 202075969U CN 2011202015766 U CN2011202015766 U CN 2011202015766U CN 201120201576 U CN201120201576 U CN 201120201576U CN 202075969 U CN202075969 U CN 202075969U
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- source electrode
- electrode driver
- operational amplifier
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Abstract
The utility model discloses a source driver and an LCD employing the same. The source driver comprises an operational amplifier positioned at an output channel of the source driver, and the power supply voltage of the operational amplifier is smaller than the analog voltage of the source driver. According to the utility model, the power consumption of the source driver can be reduced.
Description
Technical field
The utility model relates to field of liquid crystal, in particular to a kind of source electrode driver and have the LCD of this source electrode driver.
Background technology
At Thin Film Transistor-LCD (Thin Film Transistor-Liquid Crystal Display, abbreviate TFT-LCD as) field, source electrode driver in the driving circuit is the Primary Component of TFT-LCD, is undertaking the task of starting thin film transistor (TFT) and the variation of control Liquid Crystal Molecules Alignment.The complexity of the inside integration module of source electrode driver and the size of outside output load are determining the temperature and the consumed power of source electrode driver to a great extent, so the major issue that is designed to the design liquid crystal panel of source electrode driver.
The output channel of source electrode driver is provided with operational amplifier as impact damper, be used for output signal, Fig. 1 is GAMMA operational amplifier (GAMMA Operational Amplifier, abbreviate GAMMA OP as) the element synoptic diagram, Fig. 2 is the synoptic diagram of source electrode driver partial interior structure, be the graph of a relation of GAMMA OP and digital to analog converter (D/A CONVERTER), the corresponding respectively output OUT1...OUT726 of wherein every road GAMMA OP.Display voltage in the LCD is divided into two kinds of polarity, and one is positive polarity, and another is a negative polarity.When the voltage of show electrode is higher than public (common) electrode voltage, be referred to as positive polarity, when the voltage of show electrode is lower than the voltage of common electrode, be referred to as negative polarity.Fig. 3 is the reference data voltage synoptic diagram of GAMMA OP, and as shown in Figure 3, the reference data voltage of conventional GAMMA OP is no matter positive-negative polarity all is VDDA and VSSA, and general VDDA is the aanalogvoltage of source electrode driver, and VSSA ground connection is zero.In the practical application, the source electrode driver power consumption is higher, and after working long hours, the temperature of source electrode driver is higher, influences the display effect of TFT-LCD.
Than problem of higher, effective solution is not proposed as yet at present at source electrode driver power consumption in the correlation technique.
The utility model content
Propose the utility model at the source electrode driver power consumption than problem of higher, for this reason, the LCD that fundamental purpose of the present utility model is to provide a kind of source electrode driver and has this source electrode driver is to address the above problem.
To achieve these goals, according to an aspect of the present utility model, provide a kind of source electrode driver.
According to source electrode driver of the present utility model, comprise operational amplifier, this operational amplifier is positioned at the output channel of source electrode driver, it is characterized in that, and the supply voltage of operational amplifier is less than the aanalogvoltage of source electrode driver.
To achieve these goals, according on the other hand of the present utility model, provide a kind of LCD, this LCD comprises above-mentioned source electrode driver.
By the utility model, adopting the aanalogvoltage less than source electrode driver is the operational amplifier power supply, has solved the source electrode driver power consumption than problem of higher, and then has reached the effect that reduces the source electrode driver power consumption.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present utility model, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:
Fig. 1 is the GAMMA OP element synoptic diagram according to correlation technique;
Fig. 2 is the synoptic diagram according to the source electrode driver partial interior structure of correlation technique;
Fig. 3 is the reference data voltage synoptic diagram according to the GAMMA OP of correlation technique;
Fig. 4 is the MINI-LVDS transmission mode synoptic diagram according to the utility model embodiment;
Fig. 5 is that the MINI-LVDS transmission time sequence according to the utility model embodiment concerns synoptic diagram;
Fig. 6 is the GAMMA OP element synoptic diagram according to the utility model embodiment;
Fig. 7 is the reference data voltage synoptic diagram according to the GAMMA OP of the utility model first embodiment; And
Fig. 8 is the reference data voltage synoptic diagram according to the GAMMA OP of the utility model second embodiment.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the utility model below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Before introducing specific embodiment of the utility model, the principle of work of gate drivers and source electrode driver is at first described: the waveform that gate drivers is sent, TFT with each row opens in regular turn, source electrode driver is charged to required separately voltage with the display dot of a full line simultaneously, shows different GTGs.When this delegation was charged, gate drivers was just closed the TFT of this row, and the gate drivers of next line is opened the TFT of this row more then, and source electrode driver discharges and recharges the display dot of next line.So go down in regular turn, when the display dot of the last column of having substituted the bad for the good, just again since the charging again of first row.With the LCD of a 1024*768 resolution, have the grid cabling of 768 row, the source electrode cabling then needs the 1024*3=3072 bar altogether.Mostly be the renewal frequency of 60Hz with general LCD, the demonstration time of each picture is about 1/60=16.67ms.Because the grid cabling that consists of 768 row of picture, so distribute to and be about 16.67ms/768=21.7us the switching time of each bar source electrode cabling, so in the waveform that gate drivers is sent, can see, these waveforms are the then pulse wave that width is 21.7us, open the TFT of each row in regular turn.Source electrode driver then in the time of this 21.7us, via the source electrode cabling, discharges and recharges required voltage with show electrode, shows corresponding GTG.
Fig. 4 is Low Voltage Differential Signal (MINI Low Voltage Differential Signaling, abbreviate MINI-LVDS as) the transmission mode synoptic diagram, the MINI-LVDS of 6-pair is made up of 8 signal Dn0-Dn7 as shown in Figure 4, when the TFT of certain delegation opens, the TFT of this row in the opening time LVDS to (being LV0-LV5) through the rgb pixel source electrode that converts corresponding pixel voltage behind the source electrode driver to and impose on source electrode driver output channel correspondence respectively on, common electric voltage (Common Voltage with liquid crystal deflecting element, abbreviate VCOM as) form the deflection angle that pressure reduction is controlled liquid crystal molecule, circulating successively all has corresponding with it pixel voltage up to all sub-pixels.
Fig. 5 is that the MINI-LVDS transmission time sequence concerns synoptic diagram, rising edge and negative edge LVDS signal at CLK all can transmit with the position, the time of one road MINI-LVDS signal transmission is the time cycle of 4 CLK as can be seen from Figure, the 6-pair data are transmitted simultaneously, i.e. transmit 6 road MINI-LVDS in the time of 4 CLK simultaneously.
After the principle of work of explanation source electrode driver, the technical solution of the utility model is described below by specific embodiment.The utility model source electrode driver comprises operational amplifier (as GAMMA OP), and this operational amplifier is positioned at the output channel of source electrode driver, according to the supply voltage of the operational amplifier of the utility model source electrode driver aanalogvoltage less than source electrode driver.Fig. 6 is the GAMMA OP element synoptic diagram according to the utility model embodiment, as shown in Figure 6, the supply voltage of GAMMA OP element is different with the supply voltage of operational amplifier in the conventional source driver, traditional source electrode driver is when design, the supply voltage of operational amplifier adopts the aanalogvoltage of source electrode driver promptly to adopt the VDDA total head, so power consumption is bigger.In the utility model, be added in voltage on the GAMMA OP by change, employing is less than the power voltage supply of VDDA, reduce the value of the GAMMA OP supply voltage of source drive unit, because the power consumption of OP equals the product of GAMMA OP supply voltage value and electric current, thereby reduced the power consumption of OP, thereby reduce the consumed power of whole source electrode driver, reduced the temperature of source electrode driver to a great extent, strengthen driving circuit stability, improve the stability of LCD display system, make that the display effect of LCD is better.
As shown in Figure 6, operational amplifier comprises anodal operational amplifier and negative pole operational amplifier, wherein, anodal operational amplifier has the first supply voltage input end and the second supply voltage input end, the negative pole operational amplifier has the 3rd supply voltage input end and the 4th supply voltage input end, the voltage of the first supply voltage input end is the aanalogvoltage of source electrode driver, i.e. VDDA; The voltage of the second supply voltage input end is less than the aanalogvoltage of source electrode driver and more than or equal to 1/2nd of the aanalogvoltage of source electrode driver, i.e. VDDAH; The voltage of the 3rd supply voltage input end is less than the aanalogvoltage of source electrode driver and more than or equal to 1/2nd of the aanalogvoltage of source electrode driver, i.e. VDDAL; And the voltage of the 4th supply voltage input end is 0, i.e. VSSA.
The reference data voltage of conventional GAMMA OP is no matter positive-negative polarity all is VDDA and VSSA, and its supply voltage equals VDDA.In the utility model embodiment, the reference data voltage of anodal operational amplifier is VDDA and VDDAH, and its supply voltage equals VDDA and deducts VDDAH; The reference data voltage of negative pole operational amplifier is VDDAL and VSSA, and its supply voltage equals VDDAL.By changing the voltage of each GAMMA OP supply voltage input end, reduced the supply voltage of GAMMA OP, because the consumed power of GAMMA OP equals the supply voltage of GAMMAOP and the product of electric current, therefore reduced the consumed power of GAMMA OP, thereby reduced the consumed power of whole source electrode driver, reduced the temperature of source electrode driver, made driving circuit stable, and then LCD can better show each the row GTG, display effect is better.
Above-mentioned VDDAH and VDDAL all less than VDDA and more than or equal to
The supply voltage that is anodal operational amplifier is
To VDDA, the supply voltage of negative pole operational amplifier be 0 to
Why limiting VDDAH and VDDAL herein, is because can not infinitely reduce the supply voltage of GAMMA OP.In source electrode driver, require the output voltage range of anodal operational amplifier to be
The output voltage range of negative pole operational amplifier is
And the output voltage range of operational amplifier is relevant with its supply voltage, for example, when
The time, the output voltage range of anodal operational amplifier is
VDDA, the output voltage range of negative pole operational amplifier
All can't reach the output voltage range of negative pole operational amplifier requirement.Therefore, need restriction VDDAH and VDDAL, can in the supply voltage that reduces GAMMA OP, guarantee the output voltage range of operational amplifier.
Fig. 7 is the reference data voltage synoptic diagram according to the GAMMA OP of the utility model first embodiment, and as shown in Figure 7, preferably, the voltage of the second supply voltage input end equates with the voltage of the 3rd supply voltage input end.
In this embodiment, the voltage of a certain supply voltage input end of anodal operational amplifier equates with the voltage of a certain supply voltage input end of negative pole operational amplifier, is VMID_H/L, wherein, VMID_H/L less than VDDA and more than or equal to
Anodal operational amplifier has identical supply voltage input end with the negative pole operational amplifier, has reduced the complexity of source electrode driver, and when operational amplifier is powered, can adopt identical feed circuit, reduces the manufacturing cost of source electrode driver.
Preferably, the voltage of the second supply voltage input end be source electrode driver aanalogvoltage 1/2nd; The voltage of the 3rd supply voltage input end be source electrode driver aanalogvoltage 1/2nd.
In this embodiment, the voltage of the voltage of a certain supply voltage input end of anodal operational amplifier and a certain supply voltage input end of negative pole operational amplifier all is set to source electrode driver aanalogvoltage 1/2nd, not only can make anodal operational amplifier and negative pole operational amplifier have identical supply voltage input end, and when the output voltage range that satisfies two kinds of operational amplifiers requires, reduced the supply voltage of GAMMA OP to greatest extent, thereby greatly reduced the consumed power of GAMMA OP, also greatly reduced the consumed power of whole source electrode driver, reduce the temperature of source electrode driver better, make driving circuit more stable, and then LCD can better show each the row GTG, display effect is better.
Fig. 8 is the reference data voltage synoptic diagram according to the GAMMA OP of the utility model second embodiment, as shown in Figure 8, preferably, the voltage of the voltage of the second supply voltage input end and the 3rd supply voltage input end is unequal, the voltage of the second supply voltage input end is VDDAH, and the voltage of the 3rd supply voltage input end is VDDAL.
A plurality of pixel voltages of source electrode driver output impose on different rgb pixel source electrodes respectively, its behind light source of each sub-pixel can present different gray scales, and GTG has been represented the stratum level by the darkest different brightness to the brightest, the middle layer rank is many more, the picture effect that can present also just good more.Therefore, when between the voltage of the voltage of the second supply voltage input end and the 3rd supply voltage input end have difference the time, can make that the middle layer rank of GTG is more, thereby make the picture effect of LCD better.
Preferably, the difference between the voltage of the voltage of the second supply voltage input end and the 3rd supply voltage input end be-0.2V is to+0.2V.
In this embodiment, difference between the voltage by limiting the second supply voltage input end and the voltage of the 3rd supply voltage input end for-0.2V to+0.2V, there is difference in the maximum voltage that makes minimum voltage and the negative pole operational amplifier of anodal operational amplifier output of corresponding same GTG brightness export, thereby makes that the display effect of LCD is better.
Preferably, anodal operational amplifier is powered respectively by same feed circuit power supply or by different feed circuit with the negative pole operational amplifier.
When anodal operational amplifier and negative pole operational amplifier have identical supply voltage input end, can adopt same feed circuit is the power supplies of two class operational amplifiers, when the supply voltage input end of two class operational amplifiers not simultaneously, the difference that requires according to the supply voltage of two class operational amplifiers, can adopt different feed circuit respectively to the power supply of two class operational amplifiers, make operational amplifier more flexible when reducing supply voltage.
To achieve these goals, according on the other hand of the present utility model, provide a kind of LCD.
Comprise any one source electrode driver that the utility model embodiment provides according to LCD of the present utility model.
Adopt the LCD of the utility model source electrode driver, because the reduction of source electrode driver consumed power, reduced the temperature of source electrode driver, when working long hours, can be because of the source electrode driver hot display effect variation that causes LCD of generating heat, thus make that the display effect of LCD is better.
LCD also comprises feed circuit, is used for the operational amplifier power supply to source electrode driver.
In this embodiment, the supply voltage of the operational amplifier in the source electrode driver changes, and therefore peripheral circuit need be set it is powered, and this LCD is by being provided with feed circuit, operational amplifier power supply in source electrode driver makes that the display effect of LCD is better.
Operational amplifier comprises anodal operational amplifier and negative pole operational amplifier, at this moment, feed circuit comprise first feed circuit and second feed circuit, wherein, first feed circuit are used for to anodal operational amplifier power supply, and second feed circuit are used for powering to the negative pole operational amplifier.
In this embodiment,, be provided with corresponding feed circuit respectively, can better provide supply voltage to anodal operational amplifier and negative pole operational amplifier at two class operational amplifiers.When two class operational amplifiers have identical supply voltage input end, it is the power supplies of two class operational amplifiers that first feed circuit and second feed circuit can be set to identical duplex feeding circuit, or to be set to same feed circuit be the power supplies of two class operational amplifiers simultaneously; When the supply voltage input end of two class operational amplifiers not simultaneously, first feed circuit and second feed circuit according to the supply voltage of two class operational amplifiers require different, respectively to the power supply of two class operational amplifiers.This LCD is by being provided with the duplex feeding circuit, and the change of the supply voltage of operational amplifier can be better supported in anodal operational amplifier in source electrode driver and the power supply of negative pole operational amplifier, makes that the display effect of LCD is better.
As can be seen from the above description, the utility model has been realized following technique effect:
The supply voltage of the operational amplifier by reducing source electrode driver makes the consumed power of source electrode driver reduce, thereby has reduced the temperature of source electrode driver, makes driving circuit stable, and then makes that the display effect of LCD is better.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. a source electrode driver comprises operational amplifier, and described operational amplifier is positioned at the output channel of described source electrode driver, it is characterized in that, the supply voltage of described operational amplifier is less than the aanalogvoltage of described source electrode driver.
2. source electrode driver according to claim 1, described operational amplifier comprises anodal operational amplifier and negative pole operational amplifier, wherein, described anodal operational amplifier has the first supply voltage input end and the second supply voltage input end, described negative pole operational amplifier has the 3rd supply voltage input end and the 4th supply voltage input end, it is characterized in that
The voltage of the described first supply voltage input end is the aanalogvoltage of described source electrode driver;
The voltage of the described second supply voltage input end is less than the aanalogvoltage of described source electrode driver and more than or equal to 1/2nd of the aanalogvoltage of described source electrode driver;
The voltage of described the 3rd supply voltage input end is less than the aanalogvoltage of described source electrode driver and more than or equal to 1/2nd of the aanalogvoltage of described source electrode driver; And
The voltage of described the 4th supply voltage input end is 0.
3. source electrode driver according to claim 2 is characterized in that, the voltage of the described second supply voltage input end equates with the voltage of described the 3rd supply voltage input end.
4. source electrode driver according to claim 3 is characterized in that, the voltage of the described second supply voltage input end be described source electrode driver aanalogvoltage 1/2nd; The voltage of described the 3rd supply voltage input end be described source electrode driver aanalogvoltage 1/2nd.
5. source electrode driver according to claim 2 is characterized in that, the voltage of the voltage of the described second supply voltage input end and described the 3rd supply voltage input end is unequal.
6. source electrode driver according to claim 5, it is characterized in that between the voltage of the voltage of the described second supply voltage input end and described the 3rd supply voltage input end difference for-0.2V to+0.2V.
7. source electrode driver according to claim 2 is characterized in that, described anodal operational amplifier is powered respectively by same feed circuit power supply or by different feed circuit with described negative pole operational amplifier.
8. a LCD is characterized in that, comprises each described source electrode driver in the claim 1 to 7.
9. LCD according to claim 8 is characterized in that, also comprises feed circuit, is used for the operational amplifier power supply to described source electrode driver.
10. LCD according to claim 9, described operational amplifier comprises anodal operational amplifier and negative pole operational amplifier, it is characterized in that, described feed circuit comprise first feed circuit and second feed circuit, wherein, described first feed circuit are used for to described anodal operational amplifier power supply, and described second feed circuit are used for to described negative pole operational amplifier power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202015766U CN202075969U (en) | 2011-06-15 | 2011-06-15 | Source driver and LCD employing same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202015766U CN202075969U (en) | 2011-06-15 | 2011-06-15 | Source driver and LCD employing same |
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| CN202075969U true CN202075969U (en) | 2011-12-14 |
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| CN2011202015766U Expired - Lifetime CN202075969U (en) | 2011-06-15 | 2011-06-15 | Source driver and LCD employing same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102831864A (en) * | 2011-06-15 | 2012-12-19 | 青岛海信电器股份有限公司 | Source driver and liquid crystal display with source driver |
| CN108231025A (en) * | 2018-01-07 | 2018-06-29 | 苏州锵创智能设备有限公司 | A kind of source electrode drive circuit and liquid crystal display device |
| CN108257564A (en) * | 2018-01-07 | 2018-07-06 | 苏州锵创智能设备有限公司 | A kind of liquid crystal display driving method |
-
2011
- 2011-06-15 CN CN2011202015766U patent/CN202075969U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102831864A (en) * | 2011-06-15 | 2012-12-19 | 青岛海信电器股份有限公司 | Source driver and liquid crystal display with source driver |
| CN102831864B (en) * | 2011-06-15 | 2016-09-28 | 青岛海信电器股份有限公司 | Source electrode driver and there is the liquid crystal display of this source electrode driver |
| CN108231025A (en) * | 2018-01-07 | 2018-06-29 | 苏州锵创智能设备有限公司 | A kind of source electrode drive circuit and liquid crystal display device |
| CN108257564A (en) * | 2018-01-07 | 2018-07-06 | 苏州锵创智能设备有限公司 | A kind of liquid crystal display driving method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111214 Effective date of abandoning: 20160928 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |