CN1841479A - Power saving method for liquid crystal display - Google Patents
Power saving method for liquid crystal display Download PDFInfo
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- CN1841479A CN1841479A CNA2005100628191A CN200510062819A CN1841479A CN 1841479 A CN1841479 A CN 1841479A CN A2005100628191 A CNA2005100628191 A CN A2005100628191A CN 200510062819 A CN200510062819 A CN 200510062819A CN 1841479 A CN1841479 A CN 1841479A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0404—Matrix technologies
- G09G2300/0408—Integration of the drivers onto the display substrate
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0281—Arrangement of scan or data electrode driver circuits at the periphery of a panel not inherent to a split matrix structure
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/08—Details of image data interface between the display device controller and the data line driver circuit
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
Abstract
The power-saving method for LCD comprises: (a) waking up source drivers; (b) sending the video data and control signal from time schedule controller to the furthest startup source drivers on a flexible circuit board by the source driver on the board; and (c) switching the furthest drivers into power-saving mode, repeating step b and c till all source driver being switched into target mode.
Description
Technical field
The invention relates to a kind of LCD, and particularly relevant for a kind of encapsulation of employing glass flip chip (Chip On Glass, LCD COG).
Background technology
In view of advantages such as light, thin and low radiation, LCD replaces the cathode ray tube (CRT) display gradually and becomes the main flow of computer screen and TV.Except being devoted to improve the display quality of LCD, as color, to brightness when etc., manufacturer also is devoted to improve its production technology with the speed production flow process and reduce production costs.
LCD system is with time schedule controller, source electrode driver and gate driver drive liquid crystal panel.Traditional time schedule controller, source electrode driver and gate drivers system are welded in a printed circuit board (PCB) (Printed Circuit Board respectively, PCB), and then (Flexible PrintedCircuit Board FPC) electrically connects with liquid crystal panel to pass through flexible PCB.Therefore, traditional LCD needs three printed circuit board at least, and its production procedure is comparatively complicated.Along with development of technology, manufacturer has developed employing glass flip chip encapsulation (Chip On Glass, LCD COG) is used the simplification production procedure.
The 1st figure is that tradition adopts glass flip chip encapsulation (Chip On Glass, LCD synoptic diagram COG).LCD 100 comprises panel 110, multiple source driver 112, at least one gate drivers 114, printed circuit board (PCB) 120 and flexible PCB 130.These source electrode drivers 112 are to be arranged on the glass substrate of panel 110 with gate drivers 114, electrically connect by corresponding flexible PCB 130 and printed circuit board (PCB) 120 respectively.Printed circuit board (PCB) 120 is provided with the time schedule controller (not shown), uses to receive view data and control signal, sends indivedual source electrode drivers 112 and gate drivers 114 to by these flexible PCBs 130 again after the processing.
Yet, tradition adopt the glass flip chip encapsulation (Chip On Glass, the needed flexible PCB of LCD COG) is more, for instance, promptly needs 11 at the example of the 1st figure, its production procedure still has necessity of simplification.In addition, except simplifying production procedure, the number of minimizing flexible PCB also can reduce the contact number between flexible PCB and liquid crystal panel, and then reduces the probability of fault.
Summary of the invention
In view of this, purpose of the present invention is exactly that a kind of LCD that adopts the glass flip chip encapsulation is being provided, and it can utilize the minority flexible PCB to reach the purpose of data transmission.
In addition, the present invention also proposes a kind of production method of grid control signal, uses the number of further minimizing flexible PCB.
In addition, cooperate LCD of the present invention, the present invention also proposes a kind of recognition method of source electrode driver.
In addition, cooperate LCD of the present invention, the present invention also proposes a kind of source electrode driver, uses view data and control signal that unidirectional or transmitted in both directions is received from time schedule controller.
In addition, cooperate LCD of the present invention, control signal can also be utilized the package transmission technology, is integrated in minority or plain conductor, uses the lead number of further minimizing flexible PCB.
In addition, the present invention also proposes a kind of electric power management mechanism, uses the electrical source consumption that reduces LCD.
According to purpose of the present invention, a kind of electricity saving method of LCD is proposed, in order to reduce the power consumption of multiple source driver.These source electrode driver series connection are arranged on the glass substrate of LCD, LCD has at least one flexible PCB and is connected to view data and the control signal of corresponding source electrode driver with the transmission time schedule controller, and by the two-way adjacent source driver that is sent to of corresponding source electrode driver.Electricity saving method at first (a) wakes these source electrode drivers up, then (b) view data and the control signal of time schedule controller is sent to this flexible PCB correspondence via the corresponding source electrode driver of this flexible PCB the most long-range unlatching source electrode driver in both sides.Then, (c) unlatching source electrode driver that the both sides of flexible PCB correspondence are the most long-range switches to battery saving mode.Repeating step b and c switch to battery saving mode up to whole source electrode drivers of flexible PCB.
According to another object of the present invention, a kind of electricity saving method of LCD is proposed.Electricity saving method at first (a) all switches to battery saving mode with those source electrode drivers, then, and (b) the corresponding source electrode driver that the view data and the control signal of time schedule controller is sent to flexible PCB and wake corresponding source electrode driver up.Then, (c) view data of time schedule controller and control signal are transmitted the closing source electrode driver and wake the source electrode driver of closing of these most proximal end up of most proximal end of corresponding source electrode driver so far.Repeating step (c) all wakes up up to these source electrode drivers.
Description of drawings
The 1st figure is the LCD synoptic diagram that tradition adopts the glass flip chip package.
2A figure illustrates a kind of LCD synoptic diagram that adopts the glass flip chip package according to a preferred embodiment of the present invention.
2B figure illustrates the LCD synoptic diagram that adopts the glass flip chip package according to the another kind of preferred embodiment of the present invention.
The 3rd figure is the control signal synoptic diagram of the driver of LCD.
The 4th figure is the form synoptic diagram of control signal package.
5A figure is a kind of source electrode driver calcspar according to preferred embodiment of the present invention.
5B figure is the waveform generator calcspar of 5A figure source electrode driver.
5C figure is the calcspar of 5B figure identity identification device.
5D figure is the waveform synoptic diagram that produces control signal POL.
5E figure is the waveform synoptic diagram that produces control signal TP.
6A figure be can power saving reducing-pitch thread data transmission method synoptic diagram.
6B figure be can power saving explosion type data transmission method synoptic diagram.
[critical piece label declaration]
100,200: LCD
110,210: panel
112,212: source electrode driver (S/D)
114,214: gate drivers
120、220：PCB
130、230、232：FPC
225: time schedule controller
310: header field
312: control field
314: data field
410,412: receiver
413,415: transceiver
414,416: the control transceiver
424,426: data collector
420,421: waveform generator
422: bus switch
434: driver element
451: resolver
453: the identity identification device
456: comparing unit
460: signal generator
470: the initial setting device
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:
Please refer to 2A figure, it illustrates a kind of encapsulation of employing glass flip chip (Chip On Glass, LCD synoptic diagram COG) according to preferred embodiment of the present invention.LCD 200 comprises: and panel 210, multiple source driver (Source Driver, S/D) 212 (1)～211 (10), at least one gate drivers (Gate Driver) 214, printed circuit board (PCB) 220 and flexible PCB 230 and 232.These source electrode drivers 212 are to be arranged on the glass substrate of panel 210 with gate drivers 214.Printed circuit board (PCB) 220 is provided with time schedule controller 225, uses to receive view data and control signal, sends source electrode driver 212 (3) and 212 (8) respectively to by flexible PCB (FPC) 230 and 232 again after the processing.Source electrode driver 212 (3) and 212 (8) sends view data and the source control signal that receives to contiguous source electrode driver 212 (1), 212 (2), 212 (4), 212 (5) and 212 (6), 212 (7), 212 (9), 212 (10) by the lead on the glass substrate respectively again.Based on the source control signal that receives, a source electrode driver on the glass substrate, for example:, just can produce grid control signal G, use offering gate drivers 214 near the source electrode driver 212 (1) of gate drivers 214.Select source electrode driver 212 (1) near gate drivers 214 can effectively shorten conductor length with gate drivers 214, avoid unnecessary signal delay and distortion.But, in other embodiments, source electrode driver 212 (1) other source electrode driver in addition can also be used for producing grid control signal G.In the present embodiment, because the lead transmission signals that LCD 200 adopts on the glass substrate, do not need to be provided with a plurality of flexible PCBs with corresponding each source electrode driver and gate drivers, so LCD 200 needed flexible PCB numbers can reduce greatly.
In the present embodiment, source electrode driver 212 has first pattern and second pattern.Source electrode driver 212 (3) and 212 (8) is set at first pattern, can reach left simultaneously and transfer data to adjacent source electrode driver 212 to the right two-wayly, other source electrode driver 212 (1), 212 (2), 212 (4)～212 (7), 212 (9) and 212 (10) is set at second pattern, only can the single direction transmission.The source electrode driver 212 (3) of first pattern and 212 (8) can be respectively receives two set of image data and control signals by time schedule controller 225, and the view data that receives and control signal reached left respectively transfers to other source electrode driver to the right.The source electrode driver 212 (1), 212 (2), 212 (4)～212 (7), 212 (9) and 212 (10) of second pattern is only receiving view data and the control signal that the left side or the right source electrode driver transmit, can't be directly and time schedule controller 225 electric connections.In the present embodiment, because LCD 200 is the large scale liquid crystal display, with 10 source electrode drivers is example, in view of signal delay and the distortion that the lead dead resistance on glass substrate and electric capacity cause, present embodiment can two flexible PCB 230 and 232 transmission data.Yet the actual design adjustment of the number visible liquid crystal display of flexible PCB is not limited to two flexible PCBs, as long as signal delay and distortion that lead dead resistance on glass substrate and electric capacity cause are maintained at tolerance interval.
In the present embodiment, the source electrode driver 212 of liquid crystal panel can be divided into 212 (6)～212 (10) two groups of left side source electrode driver 212 (1)～212 (5) and the right source electrode drivers, two 230,232 of flexible PCBs are electrically connected at the central source electrode driver 212 (3), 212 (8) of two groups of source electrode drivers respectively, so, just effective minimization of the signal delay that causes of lead dead resistance on glass substrate and electric capacity and distortion.In like manner, actual design based on LCD, the source electrode driver 212 of liquid crystal panel can also be divided into more than three groups, and the flexible PCB more than three can also be electrically connected at respectively in the scope of respectively organizing source electrode driver, as long as signal delay and distortion that lead dead resistance on glass substrate and electric capacity cause are maintained at tolerance interval.
2B figure is the encapsulation of employing glass flip chip (Chip OnGlass, LCD 250 synoptic diagram COG) according to another preferred embodiment of the present invention.Different being in the right-hand member of panel 210 of the LCD 200 among LCD 250 and the 2A figure has more another gate drivers 216, drives with the two ends from each bar scanning linear.Remaining component 2A figure is identical, repeats no more in this.
The 3rd figure is the control signal synoptic diagram of the driver of LCD.Control signal can be divided into grid control signal G and source control signal S.For instance, grid control signal G comprise gate drivers start signal STV (Gate Driver Start Signal) with the beginning of representing a picture, gate clock signal CPV (Gate Clock Signal) to enable gate line, with gate drivers output enable signal OEV (Gate Driver Output Enable Signal) enabling the time with the definition gate line.In addition, for instance, source control signal S comprise source electrode driver start signal STH (Source DriverStart Signal) so that source electrode driver 212 begin prepare to show a horizontal line, data enable signal DE (Data Enable Signal) to begin to receive data, load signal TP (Load Signal) so that source electrode driver 212 outputting drive voltages to data line, and polarity control signal POL with control reversal of poles.
When source electrode driver start signal STH enabled, source electrode driver 212 just began to prepare to receive data.Behind a period td1, data enable signal DE promptly transfers high level to, and time schedule controller 225 just begins output image data and gives source electrode driver 212.Source electrode driver 212 can be used the output voltage that produces opposed polarity according to polarity control signal POL decision polarity.Then, load signal TP can enable so that source electrode driver 212 begins outputting drive voltages to panel 210.
In existing LCD 100, control signal system issues each source electrode driver 112 and gate drivers 114 by time schedule controller.The transmission mode system of existing control signal uses control signal of a lead transmission, therefore needs many leads to transmit these control signals.And because time schedule controller has dead resistance and stray capacitance to the lead of each source electrode driver 112 and gate drivers 114, control signal also is easy to generate delay and influences display quality.
In the present embodiment, time schedule controller 225 is integrated into control signal stream C with these control signals, and is transferred to source electrode driver 212 with a lead.For instance, control signal stream C can use the package transmission agreement respectively with a plurality of control signal boil down tos control signal package independently, uses the dependent event of each control signal of expression and is transmitted on the same lead.Time schedule controller 225 can utilize purpose identification code signal, specifies the control signal package that transmits should give which source electrode driver 212.For instance, purpose identification code signal can also be contained in the control signal package, and using provides each source electrode driver 212 acquisitions and comparison.Behind the control signal package of receiving control signal stream C, source electrode driver 212 just can solve the control signal that needs voluntarily.So, transmitting the required lead of control signal just can significantly reduce.
Because whether source electrode driver 212 needs control signal package that identification receives to oneself, therefore, each source electrode driver also needs built-in identification code signal, uses with the purpose identification code signal of time schedule controller 225 and compares.
[host-host protocol of control signal stream]
The transmission mode of existing control signal is that lead of indivedual uses is to control signal to source electrode driver and/or gate drivers from one of time schedule controller transmission, source electrode driver and gate drivers need a plurality of control signals respectively, therefore time schedule controller is a lot of to the lead number of each source electrode driver and gate drivers, make that the circuit of flexible PCB (FPC) is more, increase cost and instability.In addition, dead resistance that causes owing to lead is long and stray capacitance also can make control signal produce delay and distortion influences display quality.
In the present embodiment, time schedule controller 225 only transmits control signal stream C by a lead and gives source electrode driver 212.Utilize the package transmission technology, for instance, control signal stream C can comprise a plurality of control signal packages, and the content of each control signal package can be represented (pullhigh) incident of drawing high of corresponding control signal or drag down (pull low) incident.After source electrode driver 212 was received the control signal package, corresponding control signal just can be drawn high or be dragged down, and used to produce various required control signals.
The 4th figure is the form synoptic diagram of control signal package.A control signal package comprises header field 310 and control project, and wherein, the control project comprises control field 312 and data field 314.Header field 310 is record one predetermined pattern (pattern), and initial in order to a control signal package of identification, predetermined pattern is for example represented with 0x11111.Control field 312 is in order to the kind of recording events.Kind of event comprises signal STH incident, signal TP incident at least, draws high incident, drags down incident and initial setting incident.Data field 314 is in order to write down the parameter of this incident.
In the present embodiment, having 16 positions with each control signal package is example, if adopt dual edge sampling (dual edge sampling) to receive package, the time for reading of each control signal package is 8 clocks, that is to say, the high level that the control signal system that incident is drawn high in utilization and the incident that drags down produces needs to have 8 clocks is at least held time, and promptly can utilize the incident of drawing high and drag down the incident generation as control signal POL, CPV, STV, OEV.In addition, high level is held time less than the control signal of 8 clocks, as control signal STH and TP, then can after difference received signal STH incident and signal TP incident signal level be drawn high, and promptly transfers low level voluntarily to through scheduled time slot td2 and tw1 respectively.This case is not limited to use the dual edge sampling, also can use the mode of rising edge or falling edge sampling to receive package in addition, repeats no more in this.
Control signal package with control field 312 tracer signal STH incidents, it is in order to enabling the control signal STH of each source electrode driver 212 (1)～212 (10), and 414 of its data fields are the purpose identification code signals of the purpose source electrode driver 212 of this control signal package of expression.For instance, if the chip identification coded signal of source electrode driver 212 (1)～212 (10) is respectively 0x0001～0x1010, after purpose identification code signal (ID) that source electrode driver 212 (1) is received this control signal package and learnt the purpose source electrode driver from its data field 414 was 0x0001, the source electrode driver 212 (1) with identical chips identification code just can produce signal STH voluntarily and come display horizontal line to begin the preparing reception data.After control signal STH draws high, through just being converted to low level voluntarily behind the scheduled time slot td2.
In addition, because signal TP and CPV system draw high simultaneously, control signal package with control field 312 tracer signal TP incidents, it is in order to enable control signal TP and CPV, wherein, control signal TP is that low level, control signal CPV then need to receive just can draw behind the control signal package of the incident that drags down of record CPV signal and is low level through just drawing automatically behind the scheduled time slot tw1.
Signal POL, STV and OEV etc. can be individually draw high the control signal package of incident and record by a record to drag down the control signal package of incident and produce.Draw high the control signal package of incident with control field 312 record, its data field 314 is the signal of desiring to draw high in order to record, as signal POL, STV or OEV.Drag down the control signal package of incident with control field 312 record, its data field 314 is the signal of desiring to drag down in order to record, as signal POL, STV or OEV.
With the control signal package of control field 312 record initial setting incidents, it is in order to setting various initial set value, for example, and thrust output of source electrode driver 212 or the like.The control signal package still can write down the incident of other kind, illustrates no longer one by one in this.
In the present embodiment, utilize the control signal of control signal stream C transmission packetized, lead of minimum needs can transmit.Therefore, transmit all lead numbers that control signal to each source electrode driver 212 from time schedule controller 225 and can greatly reduce, and then simplify the layout complexity of circuit and increase product stability.In addition, cooperate lead frequency range and actual design, control signal stream C can also optionally only integrate a part of control signal and independent transmission another part control signal.In this case, though full control signal may not be certain all to be integrated in a lead, the lead number still can reduce.
[source electrode driver]
5A figure is a kind of source electrode driver calcspar according to preferred embodiment of the present invention.Source electrode driver 212 comprises: receiver 410,412, transceiver 413,415, bus switch 422, waveform generator 420,421 and driver element 434.Transceiver 413 comprises: control transceiver 414 and data collector 424, transceiver 415 comprises: control transceiver 416 and data collector 426.
Work as source electrode driver, as 212 (1)～212 (2), 212 (4)～212 (7), 212 (9)～212 (10), when being in second pattern, receiver 410 and 412 is to forbid (disabled), bus switch 422 can be closed circuit with switch SW 1 and SW2, so that transceiver 413 and transceiver 415 electric connections, that is: data collector 424 and data collector 426 electrically connect, and control transceiver 414 and control transceiver 416 electric connections.So, control signal stream and the view data received of the left side or the right control transceiver 414,416 and data collector 424,426 just can send next source electrode driver to according to assigned direction.
420,421 of waveform generators do not receive control signal stream C1, C2, and produce source control signal according to this, as STH (1), STH (2), POL (1), POL (2), TP (1), TP (2) etc., in view of the above, grid control signal G, just can produce as CPV (1), CPV (2), STV (1), STV (2), OEV (1), OEV (2) etc., wherein, grid control signal G can be produced by a selected source electrode driver.With the LCD among the 2A figure 200 is example, a source electrode driver 212 on the glass substrate, for example be near the source electrode driver 212 (1) of gate drivers 214, can be used for producing grid control signal G, source electrode driver 212 (1) other source electrode driver in addition then can not produce grid control signal G.In addition, with the LCD among the 2B figure 250 is example, two source electrode drivers on the glass substrate, for example be near the source electrode driver 212 (1) and 212 (10) of grid 214 and 216, can be used for producing grid control signal G respectively to gate drivers 214 and 216, source electrode driver 212 (1) and 212 (10) other source electrode driver in addition then can not produce grid control signal G.
After driver element 434 is received control signal STH, promptly begin lock image data D, then view data D is converted to the corresponding simulating driving voltage according to polar signal POL, after receiving load signal TP, driving voltage is sent to panel 210 then.
With source electrode driver 212 (3) is example, and it is to be in first pattern, and waveform generator 420,421 can start simultaneously, uses receiving control signal stream C1, C2 respectively, and produces and be used for source control signal and the grid control signal of transmit image data D1, D2.At this moment, control signal stream C1, C2 and view data D1 and D2 are independent each other.In addition, be example with source electrode driver 212 (2) or 212 (4), it is to be in second pattern, both can close or omit one waveform generator 420,421.At this moment, because control signal stream C1, C2 and view data D1 and D2 are communicated with each other, no matter control signal stream C is received by waveform generator 420 or 421, and source electrode driver 212 (2) or 212 (4) all can correctly produce source control signal, and produce correct grid control signal in view of the above.In addition, in second pattern, control signal stream C1, C2 can also be set at identical, and one of them waveform generator is not closed or omitted to necessity.
5B figure is the calcspar of 5A figure waveform generator.Waveform generator comprises: resolver 451, identity identification device 453, signal generator 460 and initial setting device 470.Resolver 451 in order to receive control signal stream C, use parse each control signal package after, and send to identity identification device 453, signal generator 460 or initial setting device 470 according to its control project.Tool identity identification incident is signal STH incident in this example, the control project of control signal package send identity identification device 453 to; The control project that the control signal package of incident was drawn high or dragged down to the tool control signal sends signal generator 460 to; The control project of the control signal package of tool initial setting incident sends initial setting device 470 to.
5C figure is the calcspar of 5B figure identity identification device.Identity identification device 453 comprises comparing unit 456.The chip identification code Idp of each source electrode driver system can for example be via the stitch of source electrode driver 212 on glass substrate via external setting-up, respectively it is drawn high or is pulled low to particular level and sets.Each source electrode driver 212 has different chip identification code IDp.The purpose identification code IDt that comparing unit 456 can be compared chip identification code IDp and solve from control signal stream C, and trigger control signal STH when both are consistent, wherein, the high level of the signal STH td2 that holds time can utilize comparing unit 456 to preestablish.
Shown in 5B figure, signal generator 460 can be drawn high corresponding control signal after receiving the control project of control signal package of the incident of drawing high, the high level electricity of control signal continues constant, receives the control project of the control signal package of the incident of dragging down up to signal generator 460.5D figure is the waveform synoptic diagram that produces control signal POL.After the control project of the control signal package of the incident of the drawing high H that receives POL, be about to produce the signal PH of high level; After the control project of the control signal package of the incident that the drags down L that receives POL, promptly produce low level signal PL; The coupling of signal PH and PL is signal POL.Other control signal also is to produce according to the identical practice as CPV, STV, OEV.
Only, in preferred embodiment of the present invention, when the high level of control signal is held time less than 8 clocks, as control signal TP, because reading of each control signal package be 8 clocks, utilize the incident of drawing high and the incident of dragging down to produce the method for control signal and inapplicable.5E figure is the waveform synoptic diagram that produces signal TP.When receive the TP signal draw high incident after, be the signal TH that produces high level; Then begin counting, promptly produce low level signal TL up to counting to preset period of time tw1; The coupling of signal TH and TL is signal TP.
Grid control signal still can as STH or TP, produce according to source control signal except drawing high incident according to above-mentioned use and dragging down the incident generation.Please refer to the 3rd figure.For instance, produce in the example of grid control signal at foundation STH, the method that produces signal CPV is as follows: after the signal STH of source electrode driver (1) enables, its counter just starts and begins counting, draw high when being about to signal CPV, be about to signal CPV through period tw4 again and drag down through period td6.The method that produces signal STV is as follows: after the signal STH of source electrode driver (1) enabled, its counter just started and begins counting, draws high when being about to signal STV through period td7, is about to signal STV through period tw5 again and drags down.The method that produces signal OEV is as follows: after the signal STH of source electrode driver (1) enabled, its counter just started and begins counting, draws high when being about to signal OEV through period td8, is about to signal OEV through period tw6 again and drags down.
After initial setting device 470 receives the control project of control signal package of initial setting incident, promptly export the DC value according to this to set corresponding parameters.
Because source electrode driver can produce source control signal voluntarily, do not need to produce by clock generator after pass to each source electrode driver by lead as the existing practice, therefore can avoid the transmission attenuation of source control signal.
In addition, source electrode driver more can produce grid control signal and directly pass to gate drivers, not needing needs to draw very long lead to gate drivers by time schedule controller as the existing practice, therefore can save the lead of time schedule controller to gate drivers, and promotes the quality of signal.
[power management]
6A figure be can power saving reducing-pitch thread data transmission method synoptic diagram.In the reducing-pitch thread data transmission method, view data is to pass to more long-range source electrode driver 212 earlier, and then gives nearer source electrode driver 212 gradually.Shown in the 2nd figure, following explanation will be an example with the source electrode driver 212 (1)～212 (5) on the LCD left side.At first, in step 610, time schedule controller 225 is that view data is passed to from flexible PCB 230 source electrode driver 212 (1) and 212 (5) far away, and source electrode driver 212 (1) and 212 (5) promptly enters battery saving mode then, for example with the power-off of its data collector 424 and 426.Then, in step 612, time schedule controller 225 is that view data is passed to source electrode driver 212 (2) and 212 (4), and source electrode driver 212 (2) and 212 (4) promptly enters battery saving mode then.Then, in step 614, time schedule controller 225 is that view data is passed to source electrode driver 212 (3), and source electrode driver 212 (3) promptly enters battery saving mode then.Then, each source electrode driver 212 can be received load signal TP, and this moment, each source electrode driver 212 promptly was waken up to prepare to begin to drive panel 210.The transmission method of the source electrode driver 212 (6)～212 (10) of right one side of something is identical with said method, repeats no more in this.
6B figure be can power saving explosion type data transmission method synoptic diagram.The explosion type data transmission method that is to say that view data is to give the source electrode driver 212 of nearer end earlier, and then gives source electrode driver 212 far away gradually.Shown in the 2nd figure, following explanation will be an example with the half of source electrode driver 212 (1)～212 (5) in a LCD left side.When just beginning, all source electrode drivers 212 are to enter battery saving mode.In step 622, time schedule controller 225 is to wake up from the nearest source electrode driver 212 (3) of flexible PCB 230, and transmitted image data D.Then, in step 622, source electrode driver 212 (3) wake source drivers 212 (2) and 212 (4), time schedule controller 225 is passed to source electrode driver 212 (2) and 212 (4) with view data D then.Then, in step 624, source electrode driver 212 (2) and 212 (4) is wake source driver 212 (1) and 212 (5) respectively, and time schedule controller 225 is that view data D is passed to source electrode driver 212 (1) and 212 (5) then.The transmission method of the source electrode driver 212 (6)～212 (10) of right one side of something is identical with said method, repeats no more in this.
In the above-mentioned battery saving mode, at least can be with the power-off of driver element 434, data collector 424 and 426.Because data collector 424 and 426 is in order to transmit image data, its amplitude of oscillation is big and frequency is high, institute's power consumption is very big, therefore can reduce the unnecessary data transmission by above-mentioned reducing-pitch thread transmission method or explosion type transmission method, to improve the service efficiency of power supply effectively.In addition, control transceiver 414 and 416 can not be closed power supply with waveform generator system, still can receive and dispatch control signal stream and moves according to this to guarantee source electrode driver 212.
Above-mentioned reducing-pitch thread and explosion type data transmission method can also mix use, for example are that source electrode driver 212 (1), 212 (2) and 212 (3) utilizes reducing-pitch thread, and source electrode driver 212 (4) and 212 (5) utilizes explosion type, otherwise perhaps.General those skilled in the art can do variation according to spirit of the present invention, no longer describe in detail in this.
In sum; though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; those skilled in the art; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking appended the claim person of defining.
Claims (8)
1. the electricity saving method of a LCD, in order to reduce the power consumption of multiple source driver, these source electrode driver series connection are arranged on the glass substrate of this LCD, this LCD has at least one flexible PCB, this flexible PCB is connected to corresponding source electrode driver with the view data that transmits time schedule controller and control signal and by the two-way adjacent source driver that is sent to of corresponding source electrode driver, and this electricity saving method comprises:
A. wake those source electrode drivers up;
B. the view data and the control signal of this time schedule controller is sent to this flexible PCB correspondence via the corresponding source electrode driver of this flexible PCB the most long-range unlatching source electrode driver in both sides;
C. the both sides of this flexible PCB correspondence are the most long-range unlatching source electrode driver switches to battery saving mode; And
D. repeating step b and c switch to battery saving mode up to whole source electrode drivers of this flexible PCB.
2. method according to claim 1, wherein, step a system carries out according to load signal.
3. method according to claim 1, wherein, battery saving mode system closes the data collector and the driver element of these source electrode drivers.
4. the electricity saving method of a LCD, in order to reduce the power consumption of multiple source driver, these source electrode driver series connection are arranged on the glass substrate of this LCD, this LCD has at least one flexible PCB, this flexible PCB is connected to corresponding source electrode driver with the view data that transmits time schedule controller and control signal and by the two-way adjacent source driver that is sent to of corresponding source electrode driver, and this electricity saving method comprises:
A. those source electrode drivers are all switched to battery saving mode;
B. the corresponding source electrode driver that the view data and the control signal of this time schedule controller is sent to this flexible PCB and wake this correspondence source electrode driver up;
C. the most proximal end that the view data and the control signal of this time schedule controller is sent to this correspondence source electrode driver closes source electrode driver and wakes the source electrode driver of closing of these most proximal end up; And
D. repeating step c all wakes up up to these source electrode drivers.
5. method according to claim 4, wherein, battery saving mode system closes the data collector and the driver element of these source electrode drivers.
6. the electricity saving method of a LCD, in order to reduce the power consumption of multiple source driver, these source electrode driver series connection are arranged on the glass substrate of this LCD, this LCD has at least one flexible PCB, this flexible PCB is connected to corresponding source electrode driver with the view data that transmits time schedule controller and control signal and by the two-way adjacent source driver of its first side and the adjacent source driver of second side thereof of being sent to of corresponding source electrode driver, and this electricity saving method comprises:
A. wake the source electrode driver of those first sides up, and the source electrode driver of those second sides is switched to battery saving mode;
B. the view data of this time schedule controller and control signal are sent to the source electrode driver of the most long-range first side of having waken up of this flexible PCB correspondence via the corresponding source electrode driver of this flexible PCB, and the most proximal end of second side that the view data and the control signal of this time schedule controller is sent to this correspondence source electrode driver close source electrode driver;
C. the most long-range first side of this flexible PCB correspondence is opened source electrode driver and switches to battery saving mode, and wake up this correspondence source electrode driver second side most proximal end close source electrode driver; And
D. repeating step b and c have received view data and control signal all up to those source electrode drivers.
7. method according to claim 6, wherein, step a system carries out according to load signal.
8. method according to claim 6, wherein, battery saving mode system closes the data collector and the driver element of these source electrode drivers.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100628191A CN100388349C (en) | 2005-03-31 | 2005-03-31 | Power saving method for liquid crystal display |
| EP06005657.9A EP1708168B1 (en) | 2005-03-31 | 2006-03-20 | Power saving method of a chip-on-glass liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100628191A CN100388349C (en) | 2005-03-31 | 2005-03-31 | Power saving method for liquid crystal display |
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| Publication Number | Publication Date |
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| CN1841479A true CN1841479A (en) | 2006-10-04 |
| CN100388349C CN100388349C (en) | 2008-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100628191A Expired - Fee Related CN100388349C (en) | 2005-03-31 | 2005-03-31 | Power saving method for liquid crystal display |
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| EP (1) | EP1708168B1 (en) |
| CN (1) | CN100388349C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101017640B (en) * | 2007-02-27 | 2010-06-30 | 友达光电股份有限公司 | Display panel |
| CN115966182A (en) * | 2022-12-29 | 2023-04-14 | 北京显芯科技有限公司 | Data processing method, LED control system and electronic equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201005714A (en) | 2008-07-22 | 2010-02-01 | Gigno Technology Co Ltd | Display module and driving method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3582082B2 (en) * | 1992-07-07 | 2004-10-27 | セイコーエプソン株式会社 | Matrix display device, matrix display control device, and matrix display drive device |
| US5949397A (en) * | 1994-08-16 | 1999-09-07 | Semiconductor Energy Laboratory Co., Ltd. | Peripheral driver circuit of Liquid crystal electro-optical device |
| US6124853A (en) * | 1996-09-03 | 2000-09-26 | Lear Automotive Dearborn, Inc. | Power dissipation control for a visual display screen |
| JP3367362B2 (en) * | 1997-01-29 | 2003-01-14 | 関西日本電気株式会社 | Data acquisition circuit and display driving device |
| TW373115B (en) * | 1997-02-07 | 1999-11-01 | Hitachi Ltd | Liquid crystal display device |
| JP3508837B2 (en) * | 1999-12-10 | 2004-03-22 | インターナショナル・ビジネス・マシーンズ・コーポレーション | Liquid crystal display device, liquid crystal controller, and video signal transmission method |
| KR100706742B1 (en) * | 2000-07-18 | 2007-04-11 | 삼성전자주식회사 | Flat panel display apparatus |
| JP4088422B2 (en) * | 2001-04-26 | 2008-05-21 | 株式会社日立製作所 | Display data transmission method and liquid crystal display device |
| US7508479B2 (en) * | 2001-11-15 | 2009-03-24 | Samsung Electronics Co., Ltd. | Liquid crystal display |
| DE10160098A1 (en) * | 2001-12-07 | 2003-06-18 | Koninkl Philips Electronics Nv | Arrangement for controlling a display device |
| JP4390451B2 (en) * | 2002-12-26 | 2009-12-24 | Ｎｅｃエレクトロニクス株式会社 | Display device and data side drive circuit |
| US7405719B2 (en) * | 2003-05-01 | 2008-07-29 | Genesis Microchip Inc. | Using packet transfer for driving LCD panel driver electronics |
-
2005
- 2005-03-31 CN CNB2005100628191A patent/CN100388349C/en not_active Expired - Fee Related
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2006
- 2006-03-20 EP EP06005657.9A patent/EP1708168B1/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101017640B (en) * | 2007-02-27 | 2010-06-30 | 友达光电股份有限公司 | Display panel |
| CN115966182A (en) * | 2022-12-29 | 2023-04-14 | 北京显芯科技有限公司 | Data processing method, LED control system and electronic equipment |
| CN115966182B (en) * | 2022-12-29 | 2024-02-09 | 北京显芯科技有限公司 | Data processing method, LED control system and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1708168A2 (en) | 2006-10-04 |
| CN100388349C (en) | 2008-05-14 |
| EP1708168A3 (en) | 2009-07-01 |
| EP1708168B1 (en) | 2016-11-02 |
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