CN1967645A - Low-swing differential signals transmitting device of LCD device - Google Patents
Low-swing differential signals transmitting device of LCD device Download PDFInfo
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- CN1967645A CN1967645A CN 200510115188 CN200510115188A CN1967645A CN 1967645 A CN1967645 A CN 1967645A CN 200510115188 CN200510115188 CN 200510115188 CN 200510115188 A CN200510115188 A CN 200510115188A CN 1967645 A CN1967645 A CN 1967645A
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- comparer
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- differential signals
- swing differential
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Abstract
The invention discloses an LCD low-swing differential signal transmission device, applicable to large-size LCD display. It includes the first comparator for processing sequential signals, and the first comparator makes the delay time adjustment according to the setting between timing signals and data signals, and reserved timing specifications. And, the second comparators, formed with the majority of latch-circuits, are used to process data signals, and the each second comparator connects to the first comparator, to receive the internal timing signals processed by the first comparator as the timing signals control signal of respective second comparator. In this way, it can achieve the effect of savings power, smaller amplitude and lower electromagnetic interference.
Description
Technical field:
The present invention relates to a kind of LCD, especially refer to a kind ofly LCD be reached save power supply, amplitude is less and reduces Electromagnetic Interference (Electromagnetic Interference when using, low-swing differential signals transmission (Reduced Swing Differential Signal, RSDS) device of LCD EMI).
Background technology:
(Thin-Film-TransistorLiquid-Crystal-Display mainly is divided into high pressure part and low pressure partly to general LCD in source electrode driving device TFT-LCD) (Source Driver);
(1) the partly main power consumption of high pressure is from operational amplifier, and the size of panel load is depended in the dynamic power consumption of operational amplifier, thus high pressure partly power saving whether just see whether can come the driven panel with the operational amplifier quiescent current of minimum.
(2) the partly main power consumption source of low pressure has two:
(1) dynamic current of logical circuit: the dynamic current of logical circuit depends on VDD size and operating frequency height.
(2) quiescent current of RSDS transmission interface: the RSDS transmission interface needs the comparer of ten high speeds, therefore quite power consumption, and the power consumption partly of most low pressure all comes from this.
If will understand the power saving mode of traditional low-swing differential signals transmission interface, need to understand the basic principle of operation of source electrode driving device in whole panel of LCD system, as shown in Figure 1: with XGA (eXtended Graphics Array, 1204 * 768) panel is an example, the source electrode driving device (1～1g) that needs 10 and 8 384-channel of STB end altogether, and each adjacent source electrode driving device (1～1g), it imports initial pulse wave DI01 (1)～DI01 (8) signal end (11,11a, 11b, 11c, 11d, 11e, 11f, 11g) with output initial pulse wave DI02 (1)～DI02 (8) signal end (12,12a, 12b, 12c, 12d, 12e, 12f, 12g) then link together; The video data of complete delegation is that the mode with series connection (series) is passed to last source electrode driving device 1g by first source electrode driving device 1 in regular turn, when system will begin to pass the data of certain delegation, system can send a pulse wave signal to give the initial pulse wave DI01 of input (1) the signal end 11 of first source electrode driving device 1, inform and to begin to pass data, after the 1 desired data transmission of first source electrode driving device finishes, the initial pulse wave DI02 of the output of first source electrode driving device 1 (1) signal end 12 can produce the initial pulse wave DI01 of input (2) the signal end 11a that a pulse wave signal is given second source electrode driving device 1a, and apprizing system will begin to pass second required data of source electrode driving device 1a and give it; When second source electrode driving device 1a desired data also transmit finish after, the initial pulse wave DI02 of the output of this second source electrode driving device 1a (2) signal end 12a can produce the initial pulse wave DI01 of input (3) the signal end 11b that a pulse wave signal is given the 3rd source electrode driving device 1b, apprizing system will begin to pass the 3rd data that source electrode driving device 1b is required and give it, by that analogy, several the source electrode driving device 1c～1g in back also are with the same manner Data transmission, after whole 8 source electrode driving devices have grabbed its required separately data, system can unify to pass a pulse wave signal and give all source electrode driving devices (1～1g), this moment, each source electrode driving device just can change into relative driven to panel with the data that grab together, and the picture of finishing certain delegation shows.Still finishing backward afterwards in the same manner described above, the picture of each row shows.
Source electrode driving device with general common 6-bit low-swing differential signals transmission liquid crystal display, as shown in Figure 2, this low-swing differential signals transmission interface needs the comparer (2～2i) of ten high speeds, wherein the sequential signal uses a comparer 2, data signals then to use other nine comparers (2a～2i); Yet because the operating frequency of RSDS transmission interface is quite high, be 65MHz～100MHz, (2～2i) static power consumption is quite high, if want further power saving to have only both direction: the first reduces (2～2i) the static power consumption of each comparer as far as possible for these comparers; It two is at system end nonessential power consumption to be saved.
General traditional power saving mode all is to adopt second kind; In the basic principle of operation by above-mentioned whole panel of LCD system, can know that (1～1g) has only when oneself receiving data any source electrode driving device, its low-swing differential signals transmission interface just really has effect, therefore, tradition power saving mode, be that (2a～2i) stagnates no longer power consumption when not transmitting data signals with the comparer of nine data signals special use in the low-swing differential signals transmission interface, and its sequential signal continues to carry out the action that can't do to stagnate, therefore, (1～1g) can partly save 7/8 power consumption at this to any source electrode driving device in the time of delegation; In addition because that comparer 2 that is left in the low-swing differential signals transmission interface must be used for handling the sequential signal, and the sequential signal is the basis of logic determines, therefore, tradition power saving mode in a line time to the (action that 1～1g) timing comparator can't be done to stagnate of each source electrode driving device, and since the operating frequency of low-swing differential signals transmission interface quite height be 65MHz～100MHz, as if the static power consumption that will reduce these comparers its limit is arranged all.
Summary of the invention:
Technical matters to be solved by this invention is: at the above-mentioned deficiency of prior art, provide a kind of, this LCD is reached when using save power supply, amplitude is less and reduce the low-swing differential signals transmitting device of the LCD of EMI effect applicable to large-sized LCD.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of low-swing differential signals transmitting device of LCD, this device comprises: one first comparer, this first comparer is in order to handling the sequential signal, and does the adjustment of time delay according to setting between its sequential signal and data signals and retention time specification; And most second comparers, each first comparer is made of breech lock shape circuit, can be in order to the deal with data signal, and each second comparer is connected with above-mentioned first comparer, can receive inside sequential signal that this first comparer handles out the sequential signal controlling signal as each second comparer.
Described first comparer is the highly energy-consuming comparer.Described second comparer is the low power consuming comparer.
Described breech lock shape circuit is made up of most transistor.Described transistor can be connected in series or and connecting resistance, diode, electric capacity or another transistor.Described transistorized basic structure is made up of the transistor basic structure of BJT, FET, MOS, CMOS.
Compared with prior art, advantage of the present invention is: this device reaches this LCD and saves power supply, amplitude is less and reduces the EMI effect when using, applicable to large-sized LCD.
Description of drawings:
Fig. 1 is the basic operation schematic flow sheet of known source electrode driving device in LCD.
Fig. 2 is the block schematic diagram of known source electrode driving device.
Fig. 3 is the block schematic diagram of source electrode driving device of the present invention.
Fig. 4 is the circuit diagram of the present invention's second comparer.
Fig. 5 is the circuit diagram of the present invention's first comparer.
Label declaration:
Source electrode driving device 1～1g
Import initial pulse wave DI01 signal end 11～11g
Export initial pulse wave DI02 signal end 12～12g
Comparer 2～2i first comparer 5
STB holds 10 transistors 51
Bias voltage signal end 54 first input signal ends 55
The second input signal end, 56 output signal ends 57
Second comparer, 6 transistors 61
Clock signal end 62 first voltage ends 63
Second voltage end, 64 first input ends 65
Second input end, 66 first bias terminal 67
Embodiment:
See also Fig. 3-shown in Figure 5, low-swing differential signals transmission (the Reduced Swing Differential Signal of a kind of LCD of the present invention, RSDS) device, it is made of one first comparer 5 and most second comparer 6, this LCD is reached when using saves power supply, amplitude is less and reduces Electromagnetic Interference (Electromagnetic Interference, effect EMI).
Above-mentioned first comparer of carrying 5 is in order to handling the sequential signal, and does the adjustment of time delay (Timing Delay) according to setting between its sequential signal and data signals and retention time specification (Setup/Hold time Spec).
Each second comparer 6 is made of breech lock shape circuit (Latch type), and this breech lock shape circuit is by most transistors 61, clock signal end 62, first voltage end 63, second voltage end 64, first input end 65, second input end 66, first bias terminal 67 and second bias terminal 68 are formed, can be in order to the deal with data signal, and each second comparer 6 is connected with above-mentioned first comparer 5, can receive inside sequential signal that this first comparer 5 handled out sequential signal controlling signal as each second comparer 6, in addition, this majority transistor 61 can be by BJT (Bipolar Junction Transistor), FET (Field-Effect Transistor), MOS (Metal-OxideSemiconductor) or CMOS base transistor frameworks such as (Complementary Metal-OxideSemiconductor) constitutes, and can according to the side circuit demand be connected in series between transistor as factors such as couplings or and connect an electric capacity, resistance, diode or transistor.In this way, constitute the low-swing differential signals transmitting device of a brand-new LCD by above-mentioned structure.
And the present invention proposes first comparer 5 with a non-breech lock shape circuit formation, cooperates nine second comparers 6 that use breech lock shape circuit to constitute to reach the mode of power saving, as shown in Figure 3.In first comparer 5 and second comparer 6 of this low-swing differential signals transmission interface, when in utilization, be with than second comparer 6 more at a high speed first comparer 5 of (also being more power consumption) handle the sequential signal, and a wherein enforcement circuit of this first comparer 5 as shown in Figure 5, it includes most transistors 51, one VDD signal end 52, one VSS signal end 53, one bias voltage signal end 54, one first input signal end 55, one second an input signal end 56 and an output signal end 57, do the adjustment of time delay again according to the setting between sequential signal and data signals and retention time specification by this circuit, add second comparer 6 of other nine deal with data signals special use, the inside sequential signal that this one first comparer 5 can be handled out is used as the sequential control signal of other nine second comparers 6, thus, though first comparer 5 of handling the sequential signal is than general traditional electric energy that manys consumption one twice, but because other nine second comparers 6 are to use the extremely low breech lock shape circuit of power consumption, therefore, its whole power consumption is still well below traditional situation.
In sum, the low-swing differential signals transmitting device of LCD of the present invention can effectively improve the various shortcoming of prior art, this LCD is reached when using save power supply, amplitude is less and reduce the effect of EMI, and then make that generation of the present invention is can be more progressive more practical, more meeting user's institute must, really meet the important document of application for a patent for invention, proposed patented claim in accordance with the law.
The above only is preferred embodiment of the present invention, when not limiting scope of the invention process with this; So all simple equivalent of being done according to the present patent application claim and description of the invention content change and modify, all should still belong in the scope that patent of the present invention contains.
Claims (10)
1, a kind of low-swing differential signals transmitting device of LCD, it is characterized in that: this device comprises:
One first comparer, this first comparer be in order to handling the sequential signal, and do the adjustment of time delay according to setting between its sequential signal and data signals and retention time specification; And
Most second comparers, each first comparer is made of breech lock shape circuit, can be in order to the deal with data signal, and each second comparer is connected with above-mentioned first comparer, can receive inside sequential signal that this first comparer handles out sequential signal controlling signal as each second comparer.
2, the low-swing differential signals transmitting device of LCD according to claim 1 is characterized in that: described first comparer is the highly energy-consuming comparer.
3, the low-swing differential signals transmitting device of LCD according to claim 1 is characterized in that: described second comparer is the low power consuming comparer.
4, the low-swing differential signals transmitting device of LCD according to claim 1 is characterized in that: described breech lock shape circuit is made up of most transistor.
5, the low-swing differential signals transmitting device of LCD according to claim 4 is characterized in that: but described transistor series resistor, diode, electric capacity or another transistor.
6, the low-swing differential signals transmitting device of LCD according to claim 4 is characterized in that: described transistor is connecting resistance, diode, electric capacity or another transistor also.
7, the low-swing differential signals transmitting device of LCD according to claim 4 is characterized in that: described transistorized basic structure is made up of the transistor basic structure of BJT.
8, the low-swing differential signals transmitting device of LCD according to claim 4 is characterized in that: described transistorized basic structure is made up of the transistor basic structure of FET.
9, the low-swing differential signals transmitting device of LCD according to claim 4 is characterized in that: described transistorized basic structure is made up of the transistor basic structure of MOS.
10, the low-swing differential signals transmitting device of LCD according to claim 4 is characterized in that: described transistorized basic structure is made up of the transistor basic structure of CMOS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101151885A CN100411002C (en) | 2005-11-15 | 2005-11-15 | Low-swing differential signals transmitting device of LCD device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101151885A CN100411002C (en) | 2005-11-15 | 2005-11-15 | Low-swing differential signals transmitting device of LCD device |
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| Publication Number | Publication Date |
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| CN1967645A true CN1967645A (en) | 2007-05-23 |
| CN100411002C CN100411002C (en) | 2008-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005101151885A Expired - Fee Related CN100411002C (en) | 2005-11-15 | 2005-11-15 | Low-swing differential signals transmitting device of LCD device |
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| CN (1) | CN100411002C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102215034A (en) * | 2010-04-12 | 2011-10-12 | 联发科技股份有限公司 | Flip-flop |
| US8717079B2 (en) | 2010-04-12 | 2014-05-06 | Mediatek Inc. | Flip-flop for low swing clock signal |
| CN104579258A (en) * | 2013-10-10 | 2015-04-29 | 成都国腾电子技术股份有限公司 | A range adjustable, and step length adjustable delay adjustment circuit |
| CN109087680A (en) * | 2018-08-31 | 2018-12-25 | 南京观海微电子有限公司 | A bit memory circuit for amoled plate sub-pixel |
| CN113936620A (en) * | 2021-12-15 | 2022-01-14 | 常州欣盛半导体技术股份有限公司 | Source driver and control method of input stage comparator thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4506171A (en) * | 1982-12-29 | 1985-03-19 | Westinghouse Electric Corp. | Latching type comparator |
| JP4302996B2 (en) * | 2003-01-31 | 2009-07-29 | Ｎｅｃエレクトロニクス株式会社 | Data side drive circuit of display device |
| JP4549650B2 (en) * | 2003-10-15 | 2010-09-22 | パナソニック株式会社 | Small amplitude differential interface circuit |
| JP4567356B2 (en) * | 2004-03-31 | 2010-10-20 | ルネサスエレクトロニクス株式会社 | Data transfer method and electronic apparatus |
-
2005
- 2005-11-15 CN CNB2005101151885A patent/CN100411002C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102215034A (en) * | 2010-04-12 | 2011-10-12 | 联发科技股份有限公司 | Flip-flop |
| US8717079B2 (en) | 2010-04-12 | 2014-05-06 | Mediatek Inc. | Flip-flop for low swing clock signal |
| CN102215034B (en) * | 2010-04-12 | 2014-08-20 | 联发科技股份有限公司 | Flip-flop |
| CN104124943A (en) * | 2010-04-12 | 2014-10-29 | 联发科技股份有限公司 | Flip-flop |
| CN104124943B (en) * | 2010-04-12 | 2017-04-12 | 联发科技股份有限公司 | Flip-flop |
| CN104579258A (en) * | 2013-10-10 | 2015-04-29 | 成都国腾电子技术股份有限公司 | A range adjustable, and step length adjustable delay adjustment circuit |
| CN104579258B (en) * | 2013-10-10 | 2017-07-04 | 成都振芯科技股份有限公司 | A kind of scope is adjustable, the adjustable delay regulating circuit of step-length |
| CN109087680A (en) * | 2018-08-31 | 2018-12-25 | 南京观海微电子有限公司 | A bit memory circuit for amoled plate sub-pixel |
| CN109087680B (en) * | 2018-08-31 | 2023-10-20 | 南京观海微电子有限公司 | One-bit memory circuit for amoled panel sub-pixels |
| CN113936620A (en) * | 2021-12-15 | 2022-01-14 | 常州欣盛半导体技术股份有限公司 | Source driver and control method of input stage comparator thereof |
| CN113936620B (en) * | 2021-12-15 | 2022-03-04 | 常州欣盛半导体技术股份有限公司 | Source driver and control method of input stage comparator thereof |
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| Publication number | Publication date |
|---|---|
| CN100411002C (en) | 2008-08-13 |
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