CN102779489B - Method and device for controlling voltage of LCD (liquid crystal display) based on ladder resistance network - Google Patents
Method and device for controlling voltage of LCD (liquid crystal display) based on ladder resistance network Download PDFInfo
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- CN102779489B CN102779489B CN201110121595.2A CN201110121595A CN102779489B CN 102779489 B CN102779489 B CN 102779489B CN 201110121595 A CN201110121595 A CN 201110121595A CN 102779489 B CN102779489 B CN 102779489B
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Abstract
The invention discloses a method and a device for controlling the voltage of an LCD (liquid crystal display) based on a ladder resistance network. The method comprises the following steps of regularly detecting the current voltage of a power supply which powers the LCD, and determining a voltage interval to which the current voltage belongs; according to a corresponding relation between the preset voltage interval and the number of voltage-dividing resistors, acquiring the number of the voltage-dividing resistors corresponding to the voltage interval to which the current voltage belongs; and according to the acquired number of the voltage-dividing resistors, adjusting the number of the voltage-dividing resistors connected to the ladder resistance network. By the method and the device, the real-time voltage of the power supply which powers the LCD is detected regularly and the number of the voltage-dividing resistors connected to the ladder resistance network is dynamically adjusted, so that the driving voltage of the LCD is kept stable, and the display effect of the LCD is ensured.
Description
Technical field
The present invention relates to electricity field, in particular to a kind of control method and device of LCD (Liquid Crystal Display, the liquid crystal display) voltage based on trapezoid resistance network.
Background technology
At present, the common method that generation LCD voltage drives has two kinds: (1) trapezoid resistance network; (2) charge pump.Wherein, trapezoid resistance network method is the most conventional, and the method is used comparatively cheap resistance to produce multistage LCD voltage, is generally applicable to the stable occasion of supply voltage.
Generally, as the battery of power supply handheld device, its mains fluctuations are large, while being used in LCD driving aspect, easily make LCD voltage drive unstable, cause LCD display quality not good.Be in particular in: the supply voltage of battery can in use constantly decline, the multistage LCD voltage that causes trapezoid resistance network to produce also can decline thereupon, finally cannot meet LCD and drive required voltage, causes LCD to show smudgy.
In order to overcome the above problems, some producer is in the time of deisgn product, by liquid crystal VOP (Operating Voltage, operating voltage) value reduction, do like this problem of bringing can solve low-voltage applications battery supply time, but in high voltage occasion, can bring again LCD to show time, produce the new problems such as ghost.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of control method and device of the LCD voltage based on trapezoid resistance network, at least one of to address the above problem.
According to an aspect of the present invention, provide a kind of control method of the LCD voltage based on trapezoid resistance network, having comprised: timing has detected the current voltage for the power supply of LCD power supply, determines the voltage range that this current voltage is affiliated; According to the corresponding relation of the quantity of default voltage range and divider resistance, obtain with this current voltage under the quantity of divider resistance corresponding to voltage range; According to the quantity of the divider resistance of the quantity adjustment access trapezoid resistance network of the divider resistance obtaining.
According to a further aspect in the invention, provide a kind of control device of the LCD voltage based on trapezoid resistance network, having comprised: detection module, detects the current voltage for the power supply of liquid crystal display (LCD) power supply for timing; Determination module, for determining the voltage range under current voltage; Acquisition module, for according to the corresponding relation of the quantity of default voltage range and divider resistance, obtain with current voltage under the quantity of divider resistance corresponding to voltage range; Control module, for accessing the quantity of the divider resistance of trapezoid resistance network according to the quantity adjustment of the divider resistance obtaining.
By the present invention, adopt timing to detect the real-time voltage for the power supply of LCD power supply, dynamically adjust the mode of the divider resistance quantity of access trapezoid resistance network, after having solved the VOP value that reduces liquid crystal in prior art, easily in the time of high voltage occasion, show unclear problem, thereby maintain the stable of lcd drive voltage, ensured the display effect of LCD.
Brief description of the drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the process flow diagram of the control method of the LCD voltage based on trapezoid resistance network of the embodiment of the present invention;
Fig. 2 is according to the schematic diagram of the voltage range of embodiment of the present invention division;
Fig. 3 is according to the control principle drawing of the LCD voltage based on trapezoid resistance network of the embodiment of the present invention;
Fig. 4 is according to the control device schematic diagram of the LCD voltage based on trapezoid resistance network of the embodiment of the present invention;
Fig. 5 is the control device schematic diagram of the LCD voltage based on trapezoid resistance network according to the preferred embodiment of the invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.
Fig. 1 is according to the process flow diagram of the control method of the LCD voltage based on trapezoid resistance network of the embodiment of the present invention, and as shown in Figure 1, the method mainly comprises the following steps (step S102-step S106):
Step S102, timing detects the current voltage for the power supply of liquid crystal display (LCD) power supply, determines the voltage range that this current voltage is affiliated;
In embodiments of the present invention, detect the current voltage of the power supply of powering for LCD in timing before, adjust the VOP value of LCD by technique, wherein, VOP value after adjustment is less than LCD and drives chip specifications to require the VOP value of the LCD of coupling, the object of doing is like this to have ensured in the time that supply voltage is lower, still can drive LCD.
In actual applications, the ceiling voltage that can provide according to power supply and the minimum operating voltage of LCD, divide multiple voltage ranges, as shown in Figure 2, Fig. 2 is according to the schematic diagram of the voltage range of embodiment of the present invention division, wherein, the quantity of voltage range can specifically set according to actual service condition (such as, be divided into A1, ... An interval), the ceiling voltage that power supply can provide is the maximal value (V_max) in maximum voltage interval, and the minimum operating voltage of LCD is the minimum value (V_min) in minimum voltage interval.Along with the use of battery supply, the voltage of power supply can be from A1 voltage range always toward dropping to An voltage range, and in the time that supply voltage drops to the minimum operating voltage (V_min) that is less than LCD, the driving chip of LCD can not work on.After dividing a lot of voltage range, the quantity of the divider resistance that each voltage range is corresponding just can be set, obtain the corresponding relation of the quantity of each voltage range and divider resistance.Divider resistance can require to select resistance according to specific design, adjusts the quantity of divider resistance and just can adjust the resistance of the divider resistance in actual access trapezoid resistance network, and then reach the driving voltage object of adjusting LCD.
Step S104, according to the corresponding relation of the quantity of default voltage range and divider resistance, obtain with current voltage under the quantity of divider resistance corresponding to voltage range;
Step S106, according to the quantity of the divider resistance of the quantity adjustment access trapezoid resistance network of the divider resistance obtaining.
In embodiments of the present invention, due to battery during as power supply, the electric energy of battery can be along with the growth of working time continuous decrease, its voltage can constantly decline, in order to ensure that the voltage that LCD driving circuit is got in whole trapezoid resistance network can keep the required voltage of the normal demonstration of LCD, need to reduce the voltage that divider resistance is got in good time.So, when get with the current voltage of the power supply for LCD power supply under after the divider resistance quantity that matches of voltage range, the quantity that accesses the divider resistance in trapezoid resistance network by minimizing just can make power supply continue power taking current voltage as LCD, and is unlikely to divide and obtain the LCD that supply voltage that more supply voltage causes LCD driving circuit to be got causes very little and can not normally show because of divider resistance.
For example, in actual applications, can be according to the quantity of the divider resistance obtaining, the state of each IO mouth that the driving chip of switching LCD is connected with trapezoid resistance network, the quantity of adjusting the divider resistance of access trapezoid resistance network matches with the quantity of the divider resistance obtaining.In the time that the current voltage of power supply reduces, according to the quantity of the current described divider resistance obtaining, determine the starting point of trapezoid resistance network, the state of the IO mouth that divider resistance in this network starting point is corresponding is set to delivery outlet, output high level, the state of the IO mouth that all the other divider resistances in trapezoid resistance network are corresponding is set to input port.
Fig. 3 is according to the control principle drawing of the LCD voltage based on trapezoid resistance network of the embodiment of the present invention, as shown in Figure 3, LCD drives IO mouth, the LCD bias voltage input port of chip to be connected with trapezoid resistance network respectively, R1, R2 ... Rn is the divider resistance of optional access trapezoid resistance network, Rn+1, Rn+2 ... Rn+m is LCD bias resistance, P1, P2 ... Pn is chip I/O mouth, VLm (VLCD), VLm-1 ... VL1 is LCD multilayer magnitude of voltage.Detecting current supply voltage value and judging after the residing voltage range of current power supply, the divider resistance that just can set up voltage range and trapezoid resistance network mathematics corresponding relation model between the two, in trapezoid resistance network, the divider resistance difference of access trapezoid resistance network causes the residing interval of power supply current voltage also different.For example, in the time that supply voltage is higher, it is in A1 voltage range, trapezoid resistance network partial pressure value VLm, VLm-1 ... VL1 can meet the requirement of lcd drive voltage.But in the time of voltage drop, it is in A2, A3 ... the voltage ranges such as An, trapezoid resistance network partial pressure value VLm, VLm-1 ... VL1 cannot meet LCD and drive required voltage, now, can utilize LCD low-power consumption characteristic and LCD to drive the high value characteristic close with chip power magnitude of voltage of chip output, directly adopt chip I/O (Input Output, input and output) mouthful to drive LCD dividing potential drop trapezoid resistance network.
For example, when voltage is during in A2 voltage range, can be set to delivery outlet by IO mouth P1, all the other IO mouth P2 ... Pn is set to input port.Now, P1 mouth current potential is VDD, R1 two ends equipotential, and no current flows through R1, is equivalent to R1 and does not access trapezoid resistance network, and all the other IO mouths, because be set to input port, can not exert an influence to trapezoid resistance network current potential.In the time that voltage drops to different interval gradually, can switch by the program setting in advance each IO mouth state of the driving chip of LCD, adjust the divider resistance quantity of access trapezoid resistance network, thereby the magnitudes of voltage such as VLm maintain a rational scope.For example, a micro-control unit (MCU) can be set switch the state of each IO mouth.
Referring to Fig. 2, Fig. 3, when supply voltage is during in A1 voltage range, the IO mouth P1 that the driving chip of LCD is connected with trapezoid resistance network, P2, P3 ... Pn is all set to input port, and LCD magnitude of voltage VLCD is:
In the time that supply voltage drops to A2 voltage range, the IO mouth P1 that the driving chip of LCD is connected with trapezoid resistance network is set to delivery outlet, output high level, all the other IO mouth P2, P3 ... Pn is set to input port, and LCD magnitude of voltage VLCD is:
So analogize, in the time that voltage range changes, the corresponding adjustment of the driving chip IO input/output state of LCD.In the time that supply voltage drops to the interval An of minimum operating voltage, the IO mouth Pn that chip is connected with trapezoid resistance network is set to delivery outlet, output high level, all the other IO mouth P1, P2 ... Pn-1 is set to input port, and LCD magnitude of voltage VLCD is:
From above various, when supply voltage constantly declines, the divider resistance quantity of access trapezoid resistance network constantly reduces, thereby lcd drive voltage VLCD is maintained in the voltage range of setting.
The embodiment of the present invention is by adopting timing to detect the real-time voltage for the power supply of LCD power supply, dynamically adjust the mode of the divider resistance quantity of access trapezoid resistance network, do not need to use voltage stabilizing chip, also can ensure that under wide voltage condition, liquid crystal display is clear, thereby save cost of products and extended battery, and the in the situation that of low-voltage, LCD shows still can keep clear, and user, without more renewing battery, has saved electric energy.And then maintained the stable of lcd drive voltage, ensure the display effect of LCD.
Fig. 4 is according to the control device schematic diagram of the LCD voltage based on trapezoid resistance network of the embodiment of the present invention, the said method that this device can provide for realizing the embodiment of the present invention, as shown in Figure 4, this device comprises: detection module 10, determination module 20, acquisition module 30 and control module 40.Wherein, detection module 10, detects the current voltage for the power supply of liquid crystal display (LCD) power supply for timing; Determination module 20, is connected to detection module 10, for determining the voltage range under current voltage; Acquisition module 30, is connected to determination module 20, for according to the corresponding relation of the quantity of default voltage range and divider resistance, obtain with current voltage under the quantity of divider resistance corresponding to voltage range; Control module 40, is connected to acquisition module 30, for access the quantity of the divider resistance of trapezoid resistance network according to the quantity adjustment of the divider resistance obtaining.
For example, control module 40 can be according to the quantity of the divider resistance obtaining, the state of each IO mouth that the driving chip of switching LCD is connected with trapezoid resistance network, the quantity of adjusting the divider resistance of access trapezoid resistance network matches with the quantity of the divider resistance obtaining.
Fig. 5 is the control device schematic diagram of the LCD voltage based on trapezoid resistance network according to the preferred embodiment of the invention, as shown in Figure 5, in order to reach better effect, this device can also comprise: memory module 60, for storing the corresponding relation of quantity of each voltage range of setting in advance and divider resistance, wherein, the ceiling voltage that the maximal value in each voltage range can provide for power supply, minimum value is the minimum operating voltage of module under this LCD.
The said apparatus providing by the embodiment of the present invention, detect the real-time voltage into the power supply of LCD power supply by timing, control module 40 is dynamically adjusted the mode of the divider resistance quantity of access trapezoid resistance network, therefore, in not using voltage stabilizing chip, also can ensure that under wide voltage condition, liquid crystal display is clear.
From above description, can find out, the embodiment of the present invention adopts timing to detect the real-time voltage for the power supply of LCD power supply, dynamically adjusts the mode of the divider resistance quantity of access trapezoid resistance network, in the situation that not using voltage stabilizing chip, also can ensure that under wide voltage condition, liquid crystal display is clear, thereby save cost of products and extended battery, and the in the situation that of low-voltage, LCD shows still can keep clear, and user, without more renewing battery, has saved electric energy.Maintain the stable of lcd drive voltage, ensured the display effect of LCD.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that multiple calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in memory storage and be carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or the multiple modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a control method for the LCD voltage based on trapezoid resistance network, is characterized in that, comprising:
Timing detects the current voltage for the power supply of liquid crystal display LCD power supply, determines the voltage range that described current voltage is affiliated;
According to the corresponding relation of the quantity of default voltage range and divider resistance, obtain with described current voltage under the quantity of divider resistance corresponding to voltage range;
According to the quantity of the divider resistance of the quantity adjustment access trapezoid resistance network of the described divider resistance obtaining;
Wherein, before timing detects the current voltage for the power supply of LCD power supply, described method comprises: adjust the operational voltage value of described LCD, make described operational voltage value after adjustment be less than the operational voltage value of the LCD mating with the driving chip of described LCD;
Wherein, comprise according to the quantity of the divider resistance of the quantity adjustment access trapezoid resistance network of the described divider resistance obtaining: according to the quantity of the described divider resistance obtaining, the state that switches each IO mouth that the driving chip of described LCD is connected with described trapezoid resistance network, the quantity of adjusting the divider resistance of the described trapezoid resistance network of access matches with the quantity of the described divider resistance obtaining;
Wherein, in the time that the current voltage of described power supply reduces, switch the state of each IO mouth that the driving chip of described LCD is connected with described trapezoid resistance network, comprise: according to the quantity of the current described divider resistance obtaining, determine the starting point of trapezoid resistance network, the state of the IO mouth that divider resistance in described starting point is corresponding is set to delivery outlet, output high level, and the state of the IO mouth that all the other divider resistances in described trapezoid resistance network are corresponding is set to input port.
2. method according to claim 1, is characterized in that, before timing detects the current voltage for the power supply of LCD power supply, described method also comprises:
Under the ceiling voltage that can provide according to described power supply and described LCD, the minimum operating voltage of module, divides multiple voltage ranges;
The quantity that the described divider resistance that voltage range is corresponding described in each is set, obtains described corresponding relation.
3. a control device for the LCD voltage based on trapezoid resistance network, is characterized in that, comprising:
Detection module, detect the current voltage for the power supply of liquid crystal display LCD power supply for timing, wherein, detect the current voltage of the power supply of powering for LCD in timing before, adjust the operational voltage value of described LCD, make the described operational voltage value after adjusting be less than the operational voltage value of the LCD mating with the driving chip of described LCD;
Determination module, for determining the voltage range under described current voltage;
Acquisition module, for according to the corresponding relation of the quantity of default voltage range and divider resistance, obtain with described current voltage under the quantity of divider resistance corresponding to voltage range;
Control module, for accessing the quantity of the divider resistance of trapezoid resistance network according to the quantity adjustment of the described divider resistance obtaining;
Wherein, the quantity of the described divider resistance that described control module is obtained for basis, the state that switches each IO mouth that the driving chip of described LCD is connected with described trapezoid resistance network, the quantity of adjusting the divider resistance of the described trapezoid resistance network of access matches with the quantity of the described divider resistance obtaining.
4. device according to claim 3, is characterized in that, described device also comprises:
Memory module, for storing the corresponding relation of the quantity of voltage range and divider resistance described in each setting in advance, wherein, the ceiling voltage that the maximal value described in each in voltage range can provide for described power supply, minimum value is the minimum operating voltage of module under described LCD.
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| CN201110121595.2A CN102779489B (en) | 2011-05-11 | 2011-05-11 | Method and device for controlling voltage of LCD (liquid crystal display) based on ladder resistance network |
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| CN201110121595.2A CN102779489B (en) | 2011-05-11 | 2011-05-11 | Method and device for controlling voltage of LCD (liquid crystal display) based on ladder resistance network |
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| CN102779489B true CN102779489B (en) | 2014-08-27 |
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| CN113162190B (en) * | 2021-05-10 | 2022-07-19 | 深圳市卓朗微电子有限公司 | Lithium battery pack control circuit and method based on 0Z8952 chip |
| CN113725970A (en) * | 2021-08-30 | 2021-11-30 | 安徽华米信息科技有限公司 | Power supply method and device for wearable equipment and storage medium |
| CN114360447B (en) * | 2022-01-04 | 2023-11-28 | Tcl华星光电技术有限公司 | Display driving method and display |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5745092A (en) * | 1993-12-22 | 1998-04-28 | Seiko Epson Corporation | Liquid-Crystal display system and power supply method that supply different logic source voltages to signal and scan drivers |
| CN1183571A (en) * | 1993-07-21 | 1998-06-03 | 精工爱普生株式会社 | Power supply device, liquid crystal display device, and method of supplying power |
| US6326959B1 (en) * | 1997-05-22 | 2001-12-04 | Rohm Co., Ltd. | Display panel driver |
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- 2011-05-11 CN CN201110121595.2A patent/CN102779489B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1183571A (en) * | 1993-07-21 | 1998-06-03 | 精工爱普生株式会社 | Power supply device, liquid crystal display device, and method of supplying power |
| US5745092A (en) * | 1993-12-22 | 1998-04-28 | Seiko Epson Corporation | Liquid-Crystal display system and power supply method that supply different logic source voltages to signal and scan drivers |
| US6326959B1 (en) * | 1997-05-22 | 2001-12-04 | Rohm Co., Ltd. | Display panel driver |
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