CN102045060A - Portable control device and method thereof - Google Patents
Portable control device and method thereof Download PDFInfo
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- CN102045060A CN102045060A CN2009102080404A CN200910208040A CN102045060A CN 102045060 A CN102045060 A CN 102045060A CN 2009102080404 A CN2009102080404 A CN 2009102080404A CN 200910208040 A CN200910208040 A CN 200910208040A CN 102045060 A CN102045060 A CN 102045060A
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Abstract
The invention relates to a portable control device and a method thereof. The control device comprises a driver, a base frequency controller and a quartz oscillator, wherein the driver comprises an oscillator and is used for generating a feedback signal; the base frequency controller is coupled to the driver and used for receiving the feedback signal and outputting a correction signal to the driver according to the feedback signal; and the quartz oscillator is coupled to the base frequency controller and used for generating an accurate output frequency to operate the base frequency controller.
Description
Technical field
The present invention is relevant for a kind of Portable control device, particularly relevant for a kind of Portable control device and method thereof that can correcting controlling signal.
Background technology
Fig. 1 is control device 100 schematic diagrames of prior art.Control device 100 comprises driver (driver) 110 and fundamental frequency controller 120.Prior art is in order to reduce cost, and when control device 100 was applied to mobile phone, the frame display frequency of mobile phone (frame rate) was by built-in oscillators 111 decisions of driver 110, and relevant with capacitance with the built-in resistance value in oscillator 111 the insides.At integrated circuit (integrated circuit, IC) in the manufacture process, between every wafer, every the chip, there is the technological parameter drift in the capital, therefore built-in capacitance of the oscillator in the driver 110 of each batch mobile phone 111 and resistance value neither with, cause that the diversified in specifications of different product causes when dispatching from the factory.In order to make the frame rate energy up to specification and consistent, the driver 110 of prior art is to adopt a programmed (one-time programming, OTP) element 113, survey (chip probing test in the wafer pin, CP test) time, measure the parameters of product, check whether the standard of reaching is arranged, the part that falls short of specifications reaches the function of fine setting with the OTP sequencing.Yet chip still up to specification not to the utmost can classify as defective products after repairing, can't shipment, cause yield loss.
Use a programmed element 113 except the problem that yield loss is arranged, need collocation wafer pin to survey, can expend extra testing time and testing cost, and electrical parameter has lacked the elasticity that product uses in case promptly can't do change after the OTP sequencing.Therefore need a kind of frame display frequency that can adjust portable apparatus, increase the DE that uses, control device and the method thereof that can save testing time and cost again.
Summary of the invention
The purpose of this invention is to provide a kind of DE that increases use, can save the control device and the method thereof of testing time and cost again.
The invention provides a kind of control device that is used for the portable multimedia device, comprising: a driver comprises an oscillator, in order to produce a feedback signal; One fundamental frequency controller is coupled to this driver, in order to receiving this feedback signal, and exports a correction signal to this driver according to this feedback signal; And a quartz (controlled) oscillator, be coupled to this fundamental frequency controller, in order to produce one accurately output frequency to operate this fundamental frequency controller.
The present invention also provides a kind of control method that is used for portable apparatus, and comprising step has: utilize a driver to transmit feedback signal to a fundamental frequency controller; Utilize this fundamental frequency controller to estimate the frequency of this feedback signal and a deviant of an ideal frequency; Utilize this fundamental frequency controller to produce a correction signal and give this driver according to this deviant; Utilize this driver to produce the pairing operating frequency of this correction signal; And utilize this driver to produce a display control signal according to this operating frequency.
The present invention also provides a kind of driver that is used for the portable multimedia device, comprising: an oscillator; And a register, be coupled to this oscillator, in order to store the correcting code from a correction signal representative of a fundamental frequency controller, wherein, this oscillator produces an operating frequency according to this correcting code in this register.
The present invention also provides a kind of fundamental frequency controller that is used for the portable multimedia device, couple a quartz (controlled) oscillator, to receive a reference signal, this fundamental frequency controller comprises: a phase-locked loop unit, be coupled to this quartz (controlled) oscillator, in order to this reference signal of phase-locked loop to produce an operating frequency; And a control circuit, be coupled to this phase-locked loop unit, in order to estimating a frequency offseting value of a feedback signal according to this operating frequency, and export a correction signal according to this deviant.
Description of drawings
Purpose of the present invention, characteristics and advantage can obtain more deep understanding by following conjunction with figs. to the detailed description of preferred embodiment, wherein:
Fig. 1 is the control device schematic diagram of prior art.
Fig. 2 is the control device schematic diagram according to the specific embodiment of the invention.
Fig. 3 is the control method flow chart according to the specific embodiment of the invention.
Embodiment
Fig. 2 is the control device that is used for the portable multimedia device 200 schematic diagrames according to the specific embodiment of the invention.Control device 200 comprises driver 210, fundamental frequency controller 220 and quartz (controlled) oscillator (crystaloscillator) 221.Control device 200 can be coupled to display unit 230, in order to produce display control signal 224 in display unit 230.Driver 210 is with fundamental frequency controller 220 can (flexible printedcircuit FPC) be connected by a flexible circuit board.Driver 210 comprises oscillator 211, register (register) 212 and image process unit 240.In present embodiment, oscillator 211 can be voltage-controlled oscillator (voltage-controlledoscillator, VCO) or current control oscillator (current-controlled oscillator).Driver 210 outputs one feedback signal 213 is to fundamental frequency controller 220, feedback signal 213 can be the signal of frame mark (frame mark) signal, voltage-controlled oscillator (VCO) output, signal, common electric voltage (common voltage, Vcom) signal, horizontal-drive signal or the vertical synchronizing signal of current control oscillator output.The frequency of feedback signal 213 is the output services frequencies that are relevant to by oscillator 211.This oscillator 211 has built-in trimming circuit, in order to produce different output services frequencies.After fundamental frequency controller 220 receives feedback signal 213, the frequency of feedback signal 213 be can estimate, and the frequency of feedback signal 213 and the deviant of ideal frequency estimated, need what be corrected to learn this frequency, could be near ideal frequency.Fundamental frequency controller 220 couples quartz (controlled) oscillator 221, in order to produce a reference signal with accurate frequency.Fundamental frequency controller 220 comprises a phase-locked loop (phaselocked loop, PLL) unit 222 and a control circuit 225.Phase-locked loop unit 222 carries out phase-locked loop control with the output clock pulse of quartz (controlled) oscillator 221 and synchronously with reference to clock pulse, with export one accurately clock signal in control circuit 225.For example, control circuit 225 can be estimated feedback signal 213 according to the accurate clock signal that quartz (controlled) oscillator 221 is produced, accurate frequency reference signal or its frequency multiplication that feedback signal 213 and quartz (controlled) oscillator 221 are produced are compared, can learn the frequency of feedback signal 213 and the deviant or the deviation ratio of ideal frequency.For example, control circuit 225 can be realized by microprocessor.
In this embodiment, fundamental frequency controller 220 can be according to a look-up table, find out the required pairing correcting code of corrected value (correction code) of frequency of the feedback signal 213 of desire correction, and send the correction signal 223 of this corrected value correspondence to driver 210.It should be noted that, because the frequency of the feedback signal 213 that estimates and the deviant of ideal frequency not necessarily have the corrected value of row identical with look-up table, this fundamental frequency controller 220 can be selected in the look-up table the corrected value near this deviant, or be divided into repeatedly and revise, make the last value of revising altogether and the difference of this deviant get final product less than an acceptable error amount.Fundamental frequency controller 220 can be by in the register 212 of correction signal 223 with the correcting code write driver 210 of correspondence.After oscillator 211 reads correcting code in this register 212, can determine one to give image process unit 240 corresponding to the operating frequency of this correcting code, make image process unit 240 operate to produce display control signal 224 to display unit 230 according to operating frequency, it should be noted that, the difference of the frequency values that the frequency values of display control signal 224 and specification or user set, can be less than an acceptable error deviation value, to meet the standard of hardware running, and crystal oscillator that need not be plug-in or in establish a programmed (one-time programming, OTP) element.
Table one
| Correcting code | Corrected value |
| 000 | 0％ |
| 001 | 3％ |
| 010 | 6％ |
| 011 | 9％ |
| 100 | 12％ |
| 101 | -3％ |
| 110 | -6％ |
| 111 | -9％ |
Table one is the look-up table according to the specific embodiment of the invention.Correcting code can be sent to register 212 by correction signal 223, each correcting code all has the built-in trimming circuit of the oscillator 211 of a correspondence: for example resistance capacitances of many groups combination, or one group of a plurality of current source of resistance capacitance combination collocation, a plurality of current sources can utilize current mirror (current mirror) to produce multiple drive current and the switch of respectively arranging in pairs or groups is implemented.Each group resistance capacitance combination determines an output services frequency, or each current source also determines an output services frequency to fixing one group of resistance capacitance combined charging.Therefore each correcting code can be represented the oscillator 211 output services frequencies of a correspondence.Corrected value is corresponding to different frequency correction values, and the frequency correction value is relevant to different corrections and closes the relative scale value that makes up with former preset resistance electric capacity with the resistance capacitance group, or is relevant to the different drive currents and the relative ratio of reference current.Suppose that technology drift meeting causes the absolute value drift of the drive current of the capacitance, resistance value of chip integral body and current source output, but little for the driving current value ratio value influence each other of different resistance, different electric capacity or different current source output.In this embodiment, the corrected value field of look-up table is to represent with the correction ratio.Driver 210 receives after the correction signal 223 that fundamental frequency controller 220 transmits, the oscillator 211 of driver 210 inside can be chosen the correction of these correction signal 223 correspondences and close with the resistance capacitance group, perhaps choose corresponding current sources, after one group of resistance capacitance charging, produce an operating frequency and give image process unit 240, then produce calibrated display control signal 224 in display unit 230, make the frequency values of display control signal 224 and the deviant between an ideal frequency less than a predictive error value according to this operating frequency.
In this embodiment, driver 210 need not use a programmed (one time programming, OTP) technology, and need not carry out the wafer pin and survey (chip probing test, CP test) and the OTP sequencing proofread and correct the frequency of oscillator 211 output, reach the effect of saving chip manufacturing time and cost.The action that corrects back to feedback signal 213 of present embodiment, can when starting shooting, implement in the portable multimedia device, the user also can be according to user demand, perhaps, dynamically (dynamically) revises the ideal frequency value, preferably, can increase the option of carrying out corrective action in user's interface of control device 200.In this embodiment; after control device 200 receives the instruction of carrying out corrective action; can be during the vertical blank of display unit 230 in (vertical blanking period); carry out the aforesaid action that corrects back to feedback signal 213; to adjust the value of frame display frequency to user's demand; thus, the correction of frequency can not have influence on the demonstration of normal pictures.It should be noted that, the action that the above-mentioned execution of present embodiment is proofreaied and correct can be carried out more than once, for example, deviant can be divided into repeatedly and proofread and correct, even revise side-play amount step by step, according to user's frequency handover operation, dynamically with the frequency correction of feedback signal to the ideal value of wanting, more increased the DE that product uses.
Fig. 3 is the control method flow chart according to the specific embodiment of the invention.Flow process starts from step 300.Step 310 is to utilize driver to transmit a feedback signal to give the fundamental frequency controller, for example, this feedback signal can be the signal of frame mark (frame mark) signal, voltage-controlled oscillator output, signal, common electric voltage (common voltage, Vcom) signal, horizontal-drive signal or the vertical synchronizing signal of current control oscillator output.Step 320 is to utilize the fundamental frequency controller to estimate the frequency of feedback signal and the deviant of ideal frequency.For example, can utilize counter to count to the clock pulse of several feedback signals, and estimate the deviant of its frequency values and itself and ideal frequency at the adjacent rising edge of feedback signal.Step 330 is to utilize the fundamental frequency controller to produce a correction signal according to this deviant to give driver.For example, the fundamental frequency controller can utilize a look-up table to find out the correcting code of this deviant correspondence, and will represent the correction signal of this correcting code to send driver to, this correcting code is stored in the register (register) in the driver.It should be noted that, because the frequency of the feedback signal that estimates and the deviant of ideal frequency not necessarily have the corrected value of row identical with look-up table, the fundamental frequency controller can be selected in the look-up table the corrected value near this deviant, or be divided into repeatedly correction, make that at last the difference of the value of correction and this deviant is less than predetermined error amount altogether.Step 340 is to utilize this driver to produce the operating frequency of correction signal correspondence.For example, the oscillator in the driver can read the correcting code of this correction signal correspondence from internal register, and each correcting code is represented different output services frequencies respectively.Step 350 is to utilize this driver to produce display control signal according to operating frequency.Last flow process ends at step 360.According to above step, to carry out one time the control method flow process, or be divided into repeatedly progressively correction, the frequency values of the feasible last display control signal that produces and the difference of ideal frequency value can be less than predictive error values.In another embodiment, the user can change the ideal frequency value at any time according to user demand in addition, and preferably, after having changed, in (vertical blanking period), the flow process of carrying out aforementioned control method gets final product during vertical blank at every turn.
In sum, the present invention discloses a kind of control device that is used for the portable multimedia device, comprising: a driver comprises an oscillator, in order to produce a feedback signal; One fundamental frequency controller is coupled to this driver, in order to receiving this feedback signal, and exports a correction signal to this driver according to this feedback signal; And a quartz (controlled) oscillator, be coupled to this fundamental frequency controller, in order to produce one accurately output frequency to operate this fundamental frequency controller.
The present invention also discloses a kind of control method that is used for portable apparatus, and comprising step has: utilize a driver to transmit feedback signal to a fundamental frequency controller; Utilize this fundamental frequency controller to estimate the frequency of this feedback signal and a deviant of an ideal frequency; Utilize this fundamental frequency controller to produce a correction signal and give this driver according to this deviant; Utilize this driver to produce the pairing operating frequency of this correction signal; And utilize this driver to produce a display control signal according to this operating frequency.
The present invention also discloses a kind of driver that is used for the portable multimedia device, comprising: an oscillator; And a register, be coupled to this oscillator, in order to store the correcting code from a correction signal representative of a fundamental frequency controller, wherein, this oscillator produces an operating frequency according to this correcting code in this register.
The present invention also discloses a kind of fundamental frequency controller that is used for the portable multimedia device, couple a quartz (controlled) oscillator, to receive a reference signal, this fundamental frequency controller comprises: a phase-locked loop unit, be coupled to this quartz (controlled) oscillator, in order to this reference signal of phase-locked loop to produce an operating frequency; And a control circuit, be coupled to this phase-locked loop unit, in order to estimating a frequency offseting value of a feedback signal according to this operating frequency, and export a correction signal according to this deviant.
In sum; though the present invention discloses as above with preferred embodiment; yet it is not in order to limit the present invention; be familiar with this operator; without departing from the spirit and scope of the present invention; when can making various changes that are equal to or replacement, so protection scope of the present invention is when looking accompanying being as the criterion that the application's claims are defined.
Claims (20)
1. control device that is used for the portable multimedia device comprises:
One driver comprises an oscillator, in order to produce a feedback signal;
One fundamental frequency controller is coupled to this driver, in order to receiving this feedback signal, and exports a correction signal to this driver according to this feedback signal; And
One quartz (controlled) oscillator is coupled to this fundamental frequency controller, in order to produce one accurately output frequency to operate this fundamental frequency controller.
2. control device according to claim 1, it is characterized in that this feedback signal is that a frame is marked signal, the signal that a voltage-controlled oscillator produces, signal, energising pressure altogether signal, a horizontal-drive signal or the vertical synchronizing signal that a current control oscillator produces.
3. control device according to claim 1 is characterized in that this driver comprises a register, in order to a correcting code of temporary this correction signal representative.
4. control device according to claim 1 is characterized in that, this fundamental frequency controller also comprises a control circuit, in order to the frequency that estimates this feedback signal and the deviant between an ideal frequency.
5. control device according to claim 4 is characterized in that, this ideal frequency is to be set by a user
6. control device according to claim 4 is characterized in that, this fundamental frequency controller is to export this correction signal according to this deviant.
7. control device according to claim 4 is characterized in that, this deviant be with reference to this accurately output frequency estimate.
8. control device according to claim 4 is characterized in that, this oscillator comprises a plurality of electric capacity and a plurality of resistance, in order to select in these electric capacity in a specific electric capacity or these resistance a specific resistance according to this correction signal, to determine an operating frequency.
9. control device according to claim 8 is characterized in that this driver also comprises an image process unit, in order to produce a display control signal according to this operating frequency.
10. control device according to claim 4 is characterized in that, this oscillator comprises an electric capacity, a resistance and a plurality of current source, in order to select a particular current source in these current sources according to this correction signal, to determine an operating frequency.
11. control device according to claim 10 is characterized in that, this driver also comprises an image process unit, in order to produce a display control signal according to this operating frequency.
12. a control method that is used for portable apparatus, comprising step has:
Utilize a driver to transmit feedback signal to a fundamental frequency controller;
Utilize this fundamental frequency controller to estimate the frequency of this feedback signal and a deviant of an ideal frequency;
Utilize this fundamental frequency controller to produce a correction signal and give this driver according to this deviant;
Utilize this driver to produce the pairing operating frequency of this correction signal; And
Utilize this driver to produce a display control signal according to this operating frequency.
13. control method according to claim 12, it is characterized in that this feedback signal is output signal, the output signal of a current control oscillator, energising pressure altogether signal, a horizontal-drive signal or a vertical synchronizing signal of frame mark signal, a voltage-controlled oscillator.
14. control method according to claim 12 is characterized in that, this deviant is with reference to estimating from the output frequency of a quartz (controlled) oscillator.
15. control method according to claim 12 is characterized in that, this ideal frequency is to be set by a user.
16. control method according to claim 12 is characterized in that, comprises that also correcting code with this correction signal correspondence is stored to a register and reads this correcting code for this driver.
17. a driver that is used for the portable multimedia device comprises:
One oscillator; And
One register is coupled to this oscillator, in order to the correcting code of storage from a correction signal representative of a fundamental frequency controller,
Wherein, this oscillator produces an operating frequency according to this correcting code in this register.
18. driver according to claim 17 is characterized in that, also comprises an image process unit, in order to produce a display control signal in a display unit according to this operating frequency.
19. a fundamental frequency controller that is used for the portable multimedia device couples a quartz (controlled) oscillator, to receive a reference signal, this fundamental frequency controller comprises:
One phase-locked loop unit is coupled to this quartz (controlled) oscillator, in order to this reference signal of phase-locked loop to produce an operating frequency; And
One control circuit is coupled to this phase-locked loop unit, in order to estimating a frequency offseting value of a feedback signal according to this operating frequency, and exports a correction signal according to this deviant.
20. fundamental frequency controller according to claim 19 is characterized in that, also comprises a look-up table, and this control circuit searches a correcting code of this deviant correspondence according to this look-up table, and exports this correction signal according to this correcting code.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107612635A (en) * | 2017-08-15 | 2018-01-19 | 维沃移动通信有限公司 | A kind of calibration method, mobile terminal and computer-readable recording medium |
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| CN1801632A (en) * | 2005-01-07 | 2006-07-12 | 成功芯片有限公司 | Method and circuit for producing and detecting a transmit signal |
| CN101123435A (en) * | 2006-08-08 | 2008-02-13 | 晨星半导体股份有限公司 | Method for adjusting oscillator in phase-locked loop and related frequency synthesizer |
| CN101222206A (en) * | 2007-01-09 | 2008-07-16 | 宽达科技股份有限公司 | Emendation method and apparatus for capacitance time constant of chip built-in resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6316974B1 (en) * | 2000-08-26 | 2001-11-13 | Rgb Systems, Inc. | Method and apparatus for vertically locking input and output signals |
| JP4064338B2 (en) * | 2003-12-10 | 2008-03-19 | 松下電器産業株式会社 | Delta-sigma fractional frequency division PLL synthesizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1801632A (en) * | 2005-01-07 | 2006-07-12 | 成功芯片有限公司 | Method and circuit for producing and detecting a transmit signal |
| CN101123435A (en) * | 2006-08-08 | 2008-02-13 | 晨星半导体股份有限公司 | Method for adjusting oscillator in phase-locked loop and related frequency synthesizer |
| CN101222206A (en) * | 2007-01-09 | 2008-07-16 | 宽达科技股份有限公司 | Emendation method and apparatus for capacitance time constant of chip built-in resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107612635A (en) * | 2017-08-15 | 2018-01-19 | 维沃移动通信有限公司 | A kind of calibration method, mobile terminal and computer-readable recording medium |
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