CN106297683B - Sequence controller and its control method - Google Patents
Sequence controller and its control method Download PDFInfo
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- CN106297683B CN106297683B CN201510284239.0A CN201510284239A CN106297683B CN 106297683 B CN106297683 B CN 106297683B CN 201510284239 A CN201510284239 A CN 201510284239A CN 106297683 B CN106297683 B CN 106297683B
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Abstract
The present invention relates to a kind of sequence controllers and its control method.Sequence controller includes output circuit, control circuit and mode switching circuit at this time.In the control method of this sequence controller, the first display data is transmitted by plural groups differential pair first to source electrode driver.Next, it is determined that whether the second display data for connecting the first display data is identical as the first display data.When the second display data and the first display data difference, the second display data is sent to source electrode driver using biggish first voltage.When the second display data is identical as the first display data, one of differential pair is controlled to transmit logical zero data to source electrode driver, and remaining differential pair is controlled using lesser second voltage to transmit the second logical zero data to source electrode driver, or controlling the state of remaining differential pair is suspension joint.
Description
Technical field
The present invention is interrogated about a kind of sequence controller and its control method especially with regard to mini low voltage difference is suitable for
Number (Mini Low-Voltage Differential Signaling；LVDS) sequence controller of technology and its control method.
Background technique
It is flooded with various electronic devices in people's daily life, such as：Smart phone, tablet computer, TV etc., this
A little electronic devices have display mostly, to meet the various demands of people.
Fig. 1 is please referred to, the function block schematic diagram of display 10 is painted.Display 10 includes sequence controller 12, source
Electrode driving device 14, gate drive device 16 and liquid crystal display panel 18.Sequence controller 110 is to generate source drive news
Number SDATA and gate trigger signal SSCAN is simultaneously sent to source electrode driving device 14 and gate drive device 16 respectively, so that
Liquid crystal display (Liquid Crystal Display；LCD) panel 18 shows image.
In general, source drive signal SDATA includes control signal, time pulse signal and image display signal, and source
Electrode driving device 14 includes multiple source electrode drivers (not being painted).Each source electrode driver is corresponding to provide the multiple aobvious of LCD panel
Show channel, the received image display signal of institute is converted into analog voltage driving news according to control signal and time pulse signal
Number.The analog voltage driving signal converted is used to drive LCD panel 18, to show image.
With advances in technology and expanding economy, people are more next for the quality requirements (for example, resolution) of display
More, along with the increase of quality, the power consumption of display also constantly rises, thus the power consumption of display also increasingly by
Pay attention to.
Summary of the invention
One aspect of the present invention provides a kind of sequence controller and its control method, can be effectively reduced the power consumption of display
Amount.
An embodiment according to the present invention passes through plural groups differential pair in the control method of this sequence controller first
To transmit the first display data in complex display data to source electrode driver.Then, judge that second in display data shows
Show whether data is identical as the first display data, wherein the second display data connects the first display data.Then, when the second display
When data and the first display data be not identical, normal manipulation mode step is carried out, to interrogate the first resetting using first voltage
Number with the second display data be sent to source electrode driver.When the second display data is identical as the first display data, low function is carried out
Rate operating procedure saves the first display data to control source electrode driver.In this low-power operation step, control first wherein
One differential pair transmits the first logical zero data to source electrode driver.Then, remaining differential pair is controlled using second voltage to pass
Send the second logical zero data to source electrode driver, or controlling the state of remaining differential pair is suspension joint (floating), wherein the second electricity
The value of pressure is less than the value of first voltage.
According to another embodiment of the present invention, sequence controller includes a plurality of output circuits, control circuit and mould at this time
Formula switching circuit.Output circuit to apply a plurality of output voltages respectively to plural groups differential pair, with by differential pair come according to
Sequence transmits display data to source electrode driver.Control circuit to judge the first display data in display data whether with display
The second display data in data is equal, to provide a judging result, wherein the second display data is connected in the first display data.
Mode switching circuit is to control output circuit according to judging result, to provide first voltage, second voltage and third electricity
It is depressed into differential pair, wherein the value of first voltage is greater than the value of second voltage and the value of tertiary voltage, and the value of tertiary voltage is greater than
Or the value equal to second voltage.
As shown in the above description, the sequence controller of the embodiment of the present invention and its control method are in preceding the late two strokes display data
When identical, low-power operation step is carried out by sequence controller, retains previous display data to control source electrode driver.
Low-power operation step carries out data reservation with lower power, can so make sequence controller and application sequence controller at this time
Display more power saving.
Detailed description of the invention
For above and other purpose, feature, advantage and embodiment of the invention can be clearer and more comprehensible, appended attached drawing is said
It is bright as follows：
Fig. 1 is the function block schematic diagram for being painted display.
Fig. 2 is the flow diagram for being painted the control method of sequence controller according to an embodiment of the present invention.
Fig. 3 a is the signal timing chart for being painted sequence controller according to an embodiment of the present invention under normal manipulation mode.
Fig. 3 b is the signal timing chart for being painted sequence controller according to an embodiment of the present invention under low-power operating mode.
When Fig. 3 c is the signal for being painted sequence controller according to another embodiment of the present invention under low-power operating mode
Sequence figure.
Fig. 4 is the partial function block diagram for being painted sequence controller according to an embodiment of the present invention.
Fig. 5 is the structural schematic diagram for being painted output circuit according to an embodiment of the present invention.
Specific embodiment
Fig. 2 is the flow diagram for being painted the control method 200 of sequence controller according to an embodiment of the present invention.Timing control
The 200 control sequential controller of control method of device processed sequentially transmits complex display data to source electrode driver.In this implementation
Example in, will with transmit three continuous display datas come for example, but the embodiment of the present invention be not limited to this.
In the control method 200 of sequence controller, step 210 is carried out, first to transmit the first stroke display data to source
Driver.In the present embodiment, sequence controller transmits display data to source electrode with mini low voltage difference signal technology
Driver.LVDS technology transmits display data by multiple groups differential pair (differential pair), and each differential pair includes
Two signal line, to transmit data using the differential signal between two signal line.In this example it is shown that data is with three groups
Differential pair transmits display data, but the embodiment of the present invention is not limited to this.
After step 210, step 220 is then carried out, to judge to connect second display data of the first stroke display data
It is whether identical as the first stroke display data.Since sequence controller has transmitted the first stroke display data, when sequence controller is intended to pass
When sending second display data, the content of second display data can be compared by step 220 with the first stroke display data, into
And judge whether second display data be identical as the first stroke display data.
When second display data and the first stroke display data it is not identical when, carry out normal manipulation mode step 230, with into
Enter normal manipulation mode to transmit second display data, as shown in Figure 3a.Fig. 3 a is painted timing according to an embodiment of the present invention
Signal timing chart of the controller under normal manipulation mode, wherein MLCK is the signal in the differential pair for transmit time pulse signal；ML_
V0, ML_V1, ML_V2 are the news in the differential pair for transmit display data Line1_DATA, Line2_DATA and Line3_DATA
Number, each differential pair includes an a signal line P and signal line N, to provide differential signal.In a normal operation mode, when
Sequence controller the first stroke display data Line1_DATA transmit after, can first pass through control signal line come transmit logic be 1
Signal TP, then transmission resetting signal RST and second display data Line2_DATA.
For source electrode driver, after receiving the signal TP that logic is 1, source electrode driver waits for receiving weight
Set signal RST.After receiving resetting signal RST, source electrode driver can receive second display data Line2_DATA.In step
After 230, step 220 can be then returned to, is with the display data (for example, third display data Line3_DATA) that judgement connects
It is no equal with previous display data (for example, second display data Line2_DATA).
Referring to Fig. 2 and Fig. 3 b, wherein Fig. 3 b is painted sequence controller according to an embodiment of the present invention in low-power
Signal timing chart under operation mode.In a step 220, when judging second display data and the first stroke display data not phase
Meanwhile low-power operation step 240 will be carried out, so that sequence controller enters the low-power operating mode of power saving.
In step 240, step 242 is carried out first, is 0 by the logical value control of the signal ML_V0 of differential pair.So
Afterwards, step 244 is carried out, is no signal by the logical value control of the signal ML_V1 and ML_V2 of differential pair, implies that suspension joint
(floating) state.As shown in Figure 3b, sequence controller respectively will after having transmitted the first stroke display data Line1_DATA
Differential signal ML_V0, ML_V1 and ML_V2 control are logical zero and the state of high impedance HI-Z.In this way, sequence controller is just
It is not required to generally provide relatively high power such as normal manipulation mode to generate biggish voltage swing (voltage swing).On the contrary,
In sequence controller in low-power operation step 240, lower-wattage can be used to generate the differential signal ML_V0 of logical zero, and
Differential signal ML_V1 and ML_V2 are then because floating maintains signal without electric energy.It is event, low-power operation step 240
Less electric energy can be consumed compared with normal manipulation mode step 230.
For source electrode driver, after receiving the signal TP that logic is 1, can still it be waited in source electrode driver to be received
Reset signal RST.But since sequence controller does not transmit resetting signal RST, therefore source electrode driver can retain previous pen and show
Data, i.e. the first stroke display data Line1_DATA.Since sequence controller has determined that the first stroke display data Line1_
DATA is identical as second display data Line2_DATA, therefore the first stroke display data of reservation can be used in source electrode driver
Line1_DATA replaces second display data Line2_DATA, and provides it to LCD panel to show corresponding image.
By described above it is found that the control method 200 of the sequence controller of the embodiment of the present invention constantly judges front and back two
Whether display data is identical.When continuous two display datas are identical, sequence controller can enter low-power operation mould
Formula makes the source electrode driver retain previous display data, without transmitting identical display data with relatively high power, thereby
Reach electricity saving function.In addition, it is noted that confirming that the operation mode of sequence controller, the present embodiment also mention for convenience
The operation mode of sequence controller is indicated for mode signal ML_EN.When sequence controller is in low-power operating mode, mode
Signal ML_EN will become logical zero, with the operation mode current convenient for users to understanding sequence controller.
In the above-described embodiment, low-power operating mode controls differential signal ML_V1 and ML_V2 for suspension joint shape
State, but the embodiment of the present invention is not limited to this.In other embodiments of the invention, low-power operating mode can will be poor
Dynamic signal ML_V1 and ML_V2 control is logical zero.Under normal manipulation mode, sequence controller applies first voltage to differential news
In differential pair corresponding to number ML_V0, ML_V1, ML_V2, and under low-power operating mode, sequence controller applies the second electricity
It is depressed into differential pair corresponding to differential signal ML_V1 and ML_V2, and applies tertiary voltage to differential signal ML_V0 institute
In corresponding differential pair.Value by designing first voltage is greater than the value of second voltage and tertiary voltage, and the value of tertiary voltage is big
In or equal to second voltage value, that is, can reach electricity saving function, as shown in Figure 3c.
Referring to figure 4., it is painted the partial function block diagram of sequence controller 400 according to an embodiment of the present invention.Timing
Controller 400 is for realizing sequence controller control method 200 above-mentioned.Sequence controller 400 includes control circuit 410,
Mode switching circuit 420 and a plurality of output circuits 430.Control circuit 410 to one in display data whether with connect
Another continuous is identical, and provides judging result to mode switching circuit 420.For example, control circuit 410 carries out abovementioned steps
220, it is whether identical as the second display data of connecting to judge the first display data, and send judging result to pattern switching
Circuit 420.Working mould of the mode switching circuit 420 to switch output circuit 430 according to the judging result of control circuit 410
Formula, such as normal manipulation mode or low-power operating mode.Output circuit 430 to apply a plurality of output voltages to again respectively
Array differential pair, sequentially to transmit display data to source electrode driver by these differential pairs.In the present embodiment, for side
Just illustrate, be painted three output circuits 430 only to correspond to three differential signals ML_V0, ML_V1 and ML_V2 above-mentioned, but this
The embodiment of invention is not limited to this.
Referring to figure 5., it is painted the structural schematic diagram of output circuit 430 according to an embodiment of the present invention.The present embodiment
Output circuit 430 includes current source ISAnd a plurality of switch SW.Current source ISIt is electrically connected to supply voltage VDD and is controlled by
Mode switching circuit 420 so that output circuit 430 generates first voltage, second voltage and tertiary voltage, and is applied to differential
To upper.When at output circuit 430 in a normal operation mode, the current source I of output circuit 430SFirst current value can be provided,
Such as 400 milliampere (mA).In this way, working as resistance RrxValue when being designed as 1 ohm, output circuit 430 can apply 400 millivolts
(mV) first voltage is in differential pair (node PrxWith Nrx) on, to provide voltage swing required for LVDS technology.
When output circuit 430 is under low-power operating mode, for the output circuit of output differential signal ML_V0
For 430, current source ISSecond current value, such as 200 milliamperes can be provided.In this way, output circuit 430 can apply 200 millis
The tertiary voltage of volt (mV) in differential pair, with provide maintain logical zero needed for voltage.In addition, for output differential signal
For the output circuit 430 of ML_V1 and ML_V2, current source ISIt closes without providing electric current, or provides and be less than or equal to
The electric current of 200 milliamperes.In this way, output circuit 430 does not apply a voltage in differential pair and (implies that floating), or provide small
Or the second voltage equal to tertiary voltage.
As shown in the above description, the sequence controller 400 of the embodiment of the present invention is adjusted by output current source ISOutput
Current value realizes the low-power operation step of the embodiment of the present invention, and then achievees the purpose that power saving.Although it is noted that
Previous embodiment is by adjusting current source ISCurrent value so that differential pair is become floating, but in other implementations of the invention
In example, also differential pair can be made to become floating by turning off the switch.
Although the present invention is disclosed above with several embodiments, it is not intended to limit the invention, in institute of the present invention
Belong to technical field in any tool usually intellectual, without departing from the spirit and scope of the present invention, when can make it is various change with
Retouching, therefore protection scope of the present invention is subject to be defined depending on appended claims.
【Symbol description】
10：Display
12：Sequence controller
14：Source electrode driving device
16：Gate drive device
18：Liquid crystal display panel
200：The control method of sequence controller
210-240,242-244：Step
400：Sequence controller
410：Control circuit
420：Mode switching circuit
430：Output circuit
IS：Current source
Line1_DATA,Line2_DATA,Line3_DATA：Display data
ML_CK,ML_V0,ML_V1,ML_V2：Differential signal
ML_EN：Mode signal
N,P：Signal line
Nrx、Prx：Node
RST：Reset signal
Rrx：Resistance
SDATA：Source drive signal
SSCAN：Gate trigger signal
SW：Switch
TP：Start signal
VDD：Supply voltage
Claims (10)
1. a kind of control method of sequence controller sequentially transmits complex display data extremely to control time schedule controller
The control method of one source driver, the sequence controller includes：
One first display data in the display data is transmitted by plural groups differential pair to one source driver；
Judge whether one second display data in the display data is identical as first display data, wherein described second
Display data connects first display data；
When second display data and first display data be not identical, a normal manipulation mode step is carried out, with benefit
One first resetting signal and second display data are sent to the source electrode driver with a first voltage；And
When second display data is identical as first display data, a low-power operation step is carried out, to control
It states source electrode driver and saves first display data, wherein the low-power operation step includes：
One of them described differential pair is controlled to transmit one first logical zero data to the source electrode driver；And
Remaining described differential pair is controlled using a second voltage to transmit one second logical zero data to the source electrode driver,
Or controlling the state of remaining differential pair is suspension joint, wherein the value of the second voltage is less than the value of the first voltage.
2. the control method of sequence controller as described in claim 1, which is characterized in that the quantity of the differential pair be greater than or
Equal to 3.
3. the control method of sequence controller as described in claim 1, which is characterized in that also include：
Judge whether the third display data in the display data is identical as second display data；And
When the third display data and the second display data difference, one second resetting signal of transmission and the third are aobvious
Show data to the source electrode driver.
4. the control method of sequence controller as claimed in claim 3, which is characterized in that the first logical zero data is located at
Between first display data and the first resetting signal.
5. the control method of sequence controller as described in claim 1, which is characterized in that the sequence controller utilizes one the
Three voltages transmit the first logical zero data to the source electrode driver to control the differential pair, wherein the tertiary voltage
Value be less than the first voltage value, and be greater than or equal to the second voltage value.
6. the control method of sequence controller as claimed in claim 5, which is characterized in that the sequence controller utilizes an electricity
Liu Yuan and a resistance provide the first voltage and the second voltage, and the electric current transmits institute derived from the sequence controller
One first electric current is generated during stating the first display data, and is produced during the sequence controller transmits second display data
Raw one second electric current, first electric current are greater than second electric current.
7. a kind of sequence controller, to transmit complex display data to one source driver, the sequence controller includes：
A plurality of output circuits, to apply a plurality of output voltages respectively to plural groups differential pair, to pass through the differential pair
Sequentially to transmit the display data to the source electrode driver；
One control circuit, to judge one first display data in the display data whether with one in the display data
Second display data is identical, to provide a judging result, wherein second display data is connected in first display data；
And
One mode switching circuit, to control the output circuit according to the judging result, to provide a first voltage, one
Second voltage and a tertiary voltage to the differential pair, wherein the value of the first voltage be greater than the second voltage value and
The value of tertiary voltage, and the value of the tertiary voltage is greater than or equal to the value of the second voltage.
8. sequence controller as claimed in claim 7, which is characterized in that when the judging result is no, the output electricity
Road exports the first voltage.
9. sequence controller as claimed in claim 7, which is characterized in that when the judging result, which is, is, one of institute
It states output circuit and exports the tertiary voltage to differential pair described in one of them, remaining described described second electricity of output circuit output
Being depressed into remaining described differential pair or controlling the state of remaining differential pair is suspension joint.
10. sequence controller as claimed in claim 7, which is characterized in that each output circuit includes a current source, institute
State the current value that current source is exported be it is adjustable, selectively to provide the first voltage, the second voltage and institute
State tertiary voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510284239.0A CN106297683B (en) | 2015-05-29 | 2015-05-29 | Sequence controller and its control method |
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| CN201510284239.0A CN106297683B (en) | 2015-05-29 | 2015-05-29 | Sequence controller and its control method |
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| CN106297683A CN106297683A (en) | 2017-01-04 |
| CN106297683B true CN106297683B (en) | 2018-11-30 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109727585B (en) * | 2018-12-24 | 2021-07-06 | 惠科股份有限公司 | Display driving assembly and display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540135A (en) * | 2007-11-26 | 2009-09-23 | 统宝光电股份有限公司 | Display system and method for reducing power consumption of same |
| CN105096873A (en) * | 2015-08-12 | 2015-11-25 | 京东方科技集团股份有限公司 | Image display method and liquid crystal display |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI275058B (en) * | 2005-11-10 | 2007-03-01 | Ind Tech Res Inst | Display apparatus with dynamic scanning backlight and control method and device thereof |
| TW201027498A (en) * | 2009-01-06 | 2010-07-16 | Novatek Microelectronics Corp | Driving apparatus of display and over driving methid thereof |
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- 2015-05-29 CN CN201510284239.0A patent/CN106297683B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540135A (en) * | 2007-11-26 | 2009-09-23 | 统宝光电股份有限公司 | Display system and method for reducing power consumption of same |
| CN105096873A (en) * | 2015-08-12 | 2015-11-25 | 京东方科技集团股份有限公司 | Image display method and liquid crystal display |
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