CN106782314B - Power supply chip management system and method - Google Patents
Power supply chip management system and method Download PDFInfo
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- CN106782314B CN106782314B CN201611228634.8A CN201611228634A CN106782314B CN 106782314 B CN106782314 B CN 106782314B CN 201611228634 A CN201611228634 A CN 201611228634A CN 106782314 B CN106782314 B CN 106782314B
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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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
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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
- G09G2330/04—Display protection
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Abstract
The present invention relates to a kind of power supply chip management system and method, which obtains the grayscale value of each pixel of image to be displayed the following steps are included: detection image to be displayed；Voltage parameter look-up table is searched according to the grayscale value of pixel, obtains the voltage of each pixel；The corresponding relationship of voltage parameter look-up table storage grayscale value and voltage；Screen body load voltage is calculated according to the voltage of each pixel, and according to the screen body impedance computation screen body load current value of screen body load voltage and display panel；The output voltage of power supply chip is adjusted according to the output duty cycle that screen body load current value adjusts pulse-modulated signal.Above-mentioned power supply chip management method substantially increases the efficiency of power supply chip under different loads, and power supply chip stabilised efficiency is not influenced by load current, can effectively ensure that oled panel display effect.The present invention also provides corresponding power supply chip management systems.
Description
Technical field
The present invention relates to OLED display panel technical field of power management, more particularly to a kind of power supply chip management system
And method.
Background technique
The power supply chip of OLED (Organic Light-Emitting Diode, Organic Light Emitting Diode) display panel is used
In providing electric power for panel, power supply chip provides panel driving voltage (AVDD), screen body forward voltage (ELVDD) for display panel
With screen body negative voltage (ELVSS), to guarantee that panel normally shows image.
The electric current of OLED display panel ELVDD and ELVSS when showing different pictures is different, causes in display different pictures
When power supply chip load it is different, and then influence the efficiency of power supply chip.Generally, the load current of power supply chip be 0mA~
300mA, for conventional power source chip when output load current is 0mA~50mA, for power supply chip efficiency 70%~90%, load is electric
When stream is 50mA~100mA, power supply chip efficiency can reach 90%~95%, and after load current is greater than 100mA, with load
The efficiency of the increase of electric current, power supply chip reduces, and power supply chip efficiency is only capable of reaching 85% or so.Therefore, traditional OLED is shown
The power supply chip efficiency of panel is generally relatively low, and power supply chip efficiency is influenced by load current, and power supply chip efficiency is unstable,
Influence oled panel display effect.
Summary of the invention
Based on this, it is necessary to influenced for traditional OLED display panel power supply chip by load current, efficiency it is unstable
And the problem of low efficiency, a kind of power supply chip management system and method are provided.
A kind of power supply chip management system, comprising: microprocessor, pulse modulation module and power supply chip, microprocessor
Input terminal is connect with display panel, and the output end of microprocessor and the input terminal of pulse modulation module connect, pulse modulation module
Output end and the input terminal of power supply chip connect, the output end of power supply chip connect with display panel, and microprocessor includes:
Image processing module obtains the grayscale value of each pixel of image to be displayed for detecting image to be displayed；
Data memory module, for storing voltage parameter look-up table, voltage parameter look-up table stores grayscale value and voltage
Corresponding relationship；
Data processing module obtains each pixel for searching voltage parameter look-up table according to the grayscale value of pixel
Voltage calculates screen body load voltage according to the voltage of each pixel, and is hindered according to the screen body of screen body load voltage and display panel
Body load current value is shielded in anti-calculating；And
Adjustment module is exported, for adjusting the output duty cycle of pulse modulation module according to screen body load current value, is adjusted
The output voltage of economize on electricity source chip.
Power supply chip includes forward voltage output module and negative voltage output module in one of the embodiments,
In,
Forward voltage output module includes first switch tube and the first gate driver, the input terminal connection of the first gate driver
The output end of pulse modulation module, the output end of the first gate driver and the input terminal of first switch tube connect, first switch tube
Output end connect display panel, to display panel export forward voltage；
Negative voltage module includes second switch and the second gate driver；The input terminal of second gate driver connects pulse
The input terminal of the output end of modulation module, the output end of the second gate driver and second switch connects, second switch it is defeated
Outlet connects display panel, exports negative voltage to display panel；
Microprocessor passes through the output duty cycle for adjusting pulse modulation module, to adjust first switch tube and second switch
The switching frequency of pipe, to adjust the forward voltage and negative voltage of power supply chip output.
A kind of power supply chip management method, comprising the following steps:
Image to be displayed is detected, the grayscale value of each pixel of image to be displayed is obtained；
Voltage parameter look-up table is searched according to the grayscale value of pixel, obtains the voltage of each pixel；Voltage parameter is searched
The corresponding relationship of table storage grayscale value and voltage；
Screen body load voltage is calculated according to the voltage of each pixel, and according to the screen body of screen body load voltage and display panel
Impedance computation screen body load current value；
The output voltage of power supply chip is adjusted according to the output duty cycle that screen body load current value adjusts pulse-modulated signal.
Multiple preset of voltage parameter look-up table storage ties up a grayscale value in one of the embodiments, and each preset is tied up
The corresponding voltage of point grayscale value, adjacent two default, and to tie up a grayscale value be respectively first to tie up a grayscale value and second and tie up a grayscale
Value, first tie up a grayscale value and second tie up be spaced between a grayscale value it is several it is non-tie up a grayscale value, first tie up a grayscale value and
Second ties up between a grayscale value, and the corresponding voltage of each grayscale value and grayscale value are in a linear relationship.
Be located in one of the embodiments, first tie up a grayscale value and second tie up between a grayscale value non-tie up a grayscale
It is worth corresponding voltage to be calculated by the following formula to obtain:
Wherein, A1A grayscale value, A are tied up for first2A grayscale value, A are tied up for secondiTo tie up a grayscale value and positioned at first
Two tie up between a grayscale value non-tie up a grayscale value, A1<Ai<A2；U1The corresponding voltage of a grayscale value, U are tied up for first2It is tied up for second
The corresponding voltage of point grayscale value.
The above-mentioned output duty that pulse-modulated signal is adjusted according to screen body load current value in one of the embodiments,
Than adjust power supply chip output voltage the step of include:
Current parameters look-up table is searched according to screen body load current value, obtains the corresponding impulse modulation of screen body load current value
Signal output duty cycle；Current parameters look-up table storage screen body load current value is corresponding with pulse-modulated signal output duty cycle
Relationship；
The switching frequency of the switching tube of power supply chip is adjusted, according to pulse-modulated signal output duty cycle to adjust power supply core
The output voltage of piece.
In one of the embodiments, above-mentioned pulse-modulated signal output duty cycle with screen body load current value increase and
Increase.
Above-mentioned screen body load current value is in one of the embodiments, with preset threshold subsection setup, same segment identifier
The interior corresponding pulse-modulated signal output duty cycle of screen body load current value is identical.
Above-mentioned screen body load voltage is the average voltage of the voltage of each pixel in one of the embodiments,.
Above-mentioned voltage includes forward voltage and negative voltage in one of the embodiments,.
Above-mentioned power supply chip management system and method detect image to be displayed by microprocessor, obtain image to be displayed
Each pixel grayscale value, and corresponding with image to be displayed screen body load current value is calculated according to grayscale value, according to load
The output duty cycle of current value adjustment pulse modulation module is to adjust the output voltage of power supply chip.Above-mentioned power supply chip management system
System and method adjust the output voltage of power supply chip by the output duty cycle that microprocessor adjusts pulse modulation module in real time, make
Power supply chip can adjust in real time output voltage according to external loading, so that power supply chip is maintained at optimal stable state, significantly
The efficiency of power supply chip under different loads is improved, power supply chip stabilised efficiency is not influenced by load current, can effectively be protected
Demonstrate,prove oled panel display effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of power-supply management system in figure one embodiment；
Fig. 2 is the structural schematic diagram of microprocessor in one embodiment；
Fig. 3 is the electrical block diagram of power supply chip in one embodiment；
Fig. 4 is the flow chart of method for managing power supply in one embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the present invention, not
For limiting the present invention.
Referring to Fig. 1, a kind of power supply chip management system, comprising: microprocessor 100, pulse modulation module 120 and power supply
The input terminal of chip 140, microprocessor 100 is connect with display panel, the output end and pulse modulation module of microprocessor 100
120 input terminal connection, the output end of pulse modulation module 120 are connect with the input terminal of power supply chip 140, power supply chip 140
Output end connect with display panel.
As shown in Fig. 2, microprocessor 100 includes: image processing module 102, data memory module 104, data processing mould
Block 106 and output adjustment module 108.Wherein, image processing module 102 obtains image to be displayed for detecting image to be displayed
Each pixel grayscale value；Data memory module 104 is for storing voltage parameter look-up table, voltage parameter look-up table storage ash
The corresponding relationship of rank value and voltage；Data processing module 106 is used to search voltage parameter look-up table according to the grayscale value of pixel,
The voltage for obtaining each pixel calculates screen body load voltage according to the voltage of each pixel, and according to screen body load voltage and shows
Show the screen body impedance computation screen body load current value of panel；Adjustment module 108 is exported to be used to be adjusted according to screen body load current value
The output duty cycle of pulse modulation module adjusts the output voltage of power supply chip.
As shown in figure 3, in one embodiment, power supply chip 140 includes forward voltage output module 141 and negative voltage
Output module 142, forward voltage output module 141 include first switch tube 143 and the first gate driver 145, first driving
The output end of the input terminal connection pulse modulation module 120 of device 145, the output end and first switch tube of the first gate driver 145
143 input terminal connection, the output end of first switch tube 143 connect display panel, export forward voltage to display panel；Negative sense
Voltage module 142 includes second switch 144 and the second gate driver 146；The input terminal of second gate driver 146 connects pulse
The output end of the output end of modulation module 120, the second gate driver 146 is connect with the input terminal of second switch 144, and second opens
The output end for closing pipe 144 connects display panel, exports negative voltage to display panel；Microprocessor 100 is by adjusting pulse tune
The output duty cycle of molding block 120, so that the switching frequency of first switch tube 143 and second switch 144 is adjusted, to adjust electricity
The forward voltage and negative voltage that source chip 140 exports.
As shown in Figure 1, Figure 3, power supply chip 140 include forward voltage output module 141, negative voltage output module 142,
Driving voltage output module 147.For driving voltage output module 147 for exporting constant panel driving voltage, driving voltage is defeated
The input terminal of module 147 connects power input VINP out, and output end connects driving voltage output end VO2；Forward voltage output
Module 141 and negative voltage output module 142 are connected in parallel with driving voltage output module 147.Forward voltage output module 141
The first gate driver 145 connect with the output end of pulse modulation module 120 by the first input control end ELON1, first opens
The output end for closing pipe 143 connects forward voltage output end VO1；Second gate driver 146 of negative voltage output module 142 passes through
Second input control end ELON2 is connect with the output end of pulse modulation module 120, and the output end connection of second switch 145 is helped
Phase voltage output end VO2.Specifically, first switch tube 143 and second switch 145 are all opened using MOSFET in the present embodiment
Guan Guan.
In the present embodiment, pulse modulation module 120 is arranged outside power supply chip 140, broadens pulse modulation module 120
Pulse regulation range, the adjustable range of pulse modulation module 120 is big, makes power supply chip can be within the scope of broader external loading
It is maintained at optimal stable state, and is conducive to reduce the volume of power supply chip.
Referring to Fig. 4, a kind of power supply chip management method, comprising the following steps:
Step 402: detection image to be displayed obtains the grayscale value of each pixel of image to be displayed.
Specifically, the viewing area of OLED display panel is the picture formed by multiple pixel units that can show different colours
Vegetarian refreshments battle array, wherein each pixel unit includes red sub-pixel, green sub-pixels and blue subpixels.Pixel gray level value indicates
The pixel gray level value of three kinds of color sub-pixels in pixel unit, be with certain data mode to three kinds of color sub-pixels grayscale values into
Row combination, the size of pixel gray level Value Data and resolution ratio, that is, pixel-matrix size of screen are related.In the present embodiment, image
Processing module is detected frame image to be shown, and uses picture decoding method, such as uses binarization method by graphics
For corresponding RGB grayscale parameter value, the grayscale value of all pixels point of image to be displayed is obtained.
Step 404: voltage parameter look-up table being searched according to the grayscale value of pixel, obtains the voltage of each pixel；Voltage
The corresponding relationship of Parameter lookup step storage grayscale value and voltage.
Specifically, the voltage of pixel includes forward voltage and negative voltage, in the present embodiment, voltage parameter is stored in advance
Look-up table, voltage parameter look-up table stores each corresponding forward voltage of grayscale value (0~255) and negative voltage, by looking into
Voltage parameter look-up table is looked for obtain the forward voltage and negative voltage of each pixel.
Step 406: screen body load voltage being calculated according to the voltage of each pixel, and according to screen body load voltage and display surface
The screen body impedance computation screen body load current value of plate.
Specifically, in one embodiment, for the display efficiency for guaranteeing each pixel, screen body load voltage is each pixel
The average voltage of the voltage of point.After the forward voltage and the negative voltage that get each pixel by step 404, institute is calculated
There are the forward voltage average value and negative voltage average value of pixel, obtain screen body forward direction load voltage and shields body negative sense load electricity
Pressure.Later, according to the screen body impedance computation screen body positive load current value of screen body forward direction load voltage and display panel, according to screen
The absolute value and screen body impedance computation screen body negative load current value of body negative sense load voltage.
Step 408: power supply chip is adjusted according to the output duty cycle that screen body load current value adjusts pulse-modulated signal
Output voltage.
Specifically, adjusting impulse modulation according to positive load current value and negative load current value respectively in the present embodiment
The output duty cycle of signal, to adjust the forward voltage and negative voltage of power supply chip output.Microprocessor is loaded according to forward direction
Current value obtains the pulse-modulated signal output duty cycle of output to forward voltage output module, is obtained according to negative load current value
The pulse-modulated signal output duty cycle of output valve negative voltage output module is taken, and the output duty cycle that will acquire is sent to
Pulse modulation module, pulse modulation module export corresponding pulse-modulated signal to positive electricity according to the output duty cycle received
Output module and negative voltage output module are pressed, the forward voltage and negative voltage of power supply chip output are adjusted.
In one embodiment, multiple preset of voltage parameter look-up table storage ties up a grayscale value, and each preset ties up an ash
Rank is worth corresponding voltage, and adjacent two default, and to tie up a grayscale value be respectively first to tie up a grayscale value and second and tie up a grayscale value,
First tie up a grayscale value and second tie up be spaced between a grayscale value it is several it is non-tie up a grayscale value, tie up a grayscale value and second first
It ties up between a grayscale value, the corresponding voltage of each grayscale value and grayscale value are in a linear relationship.
Further, in one embodiment, positioned at first tie up a grayscale value and second tie up between a grayscale value non-tie up
The corresponding voltage of point grayscale value is calculated by the following formula to obtain:
Wherein, A1A grayscale value, A are tied up for first2A grayscale value, A are tied up for secondiTo tie up a grayscale value and positioned at first
Two tie up between a grayscale value non-tie up a grayscale value, A1<Ai<A2；U1The corresponding voltage of a grayscale value, U are tied up for first2It is tied up for second
The corresponding voltage of point grayscale value.
Specifically, the data memory module of microprocessor stores voltage parameter look-up table, voltage parameter look-up table storage ash
Rank value-voltage parameter corresponding relationship, and voltage parameter look-up table stores the corresponding relationship of the grayscale value and voltage.Grayscale value
Including 0~255 totally 256 values, if the corresponding relationship for storing whole grayscale values and voltage needs to occupy larger memory space.
In the present embodiment, memory space is occupied for reduction data storage, storage is default to tie up a little corresponding voltage parameter, presets for two and ties up a little
Non- between grayscale value ties up the corresponding voltage of a grayscale value and grayscale value is in a linear relationship, i.e., ties up a grayscale value and second first
It ties up between a grayscale value, the corresponding sinusoidal voltage of each grayscale value increases grayscale value and increases, and the corresponding negative sense of each grayscale value is electric
Pressure increases with grayscale value and is reduced.
Specifically, being located at the non-corresponding voltage of a grayscale value of tying up that two are tied up between a grayscale value passes through above formula (1)
It is calculated.For example, in one embodiment, as shown in following table one, voltage parameter look-up table storage 25 is default to tie up an ash
The corresponding relationship of rank value and voltage greatly reduces data storage capacity, effectively save memory space.If the grayscale value of pixel is
It is non-to tie up a grayscale value, then first judge in the corresponding voltage of grayscale value for searching the pixel this it is non-tie up a grayscale value be located at that two
It is a to tie up between a grayscale value, the non-value interval for tying up a grayscale value is obtained, determines basis after the non-value interval for tying up a grayscale value
Formula (1) calculates the corresponding voltage parameter of the grayscale value, obtains the voltage of the pixel.Such as, in one embodiment, picture is obtained
The grayscale value of vegetarian refreshments is 9, which ties up a grayscale value to be non-, obtains the grayscale value by judgement and is located at grayscale value 7 and grayscale
Between value 11, i.e., adjacent thereto first tie up a grayscale value be 7, second tie up a grayscale value be 11, pass through above formula (1) calculate
The forward voltage for the pixel that grayscale value is 9 is 2.985V, and negative voltage is -2.525V.
One voltage parameter look-up table of table
In one embodiment, step 408 is searched the following steps are included: searching current parameters according to screen body load current value
Table obtains the corresponding pulse-modulated signal output duty cycle of screen body load current value, the storage screen body load of current parameters look-up table
The corresponding relationship of current value and pulse-modulated signal output duty cycle；Power supply core is adjusted according to pulse-modulated signal output duty cycle
The switching frequency of the switching tube of piece, to adjust the output voltage of power supply chip.
Specifically, obtaining pulse-modulated signal in the present embodiment by searching for pre-stored current parameters look-up table and accounting for
Empty ratio stores the corresponding pulse-modulated signal output of screen body load current value within the scope of 0~300mA in current parameters look-up table
Duty ratio.In one embodiment, pulse-modulated signal output duty cycle increases with screen body load current value and is increased, accordingly
, the switching frequency of first switch tube and second switch increases with duty ratio and is increased, and increases with first switch tube switching frequency
Greatly, the forward voltage of forward voltage output module output increases；Increase with the switching frequency of second switch, negative voltage output
The negative voltage of module output reduces.
In one embodiment, screen body of the screen body load current value with preset threshold subsection setup, in same piecewise interval
The corresponding pulse-modulated signal output duty cycle of load current value is identical.
Microprocessor passes through the output duty cycle adjusting first switch tube and second switch for adjusting pulse modulation module
Switching frequency makes power supply chip work in high efficiency region, the present embodiment, by load current with preset threshold subsection setup,
The corresponding output duty cycle of current value in each current value piecewise interval is identical, by corresponding defeated of every section of segmented current value
Duty ratio is stored in different registers out, and microprocessor controls pulse modulation module output in different current value piecewise intervals
The waveform of different duty.
Specifically, load current value segmented current is not fixed, it is segmented according to maximum current, preset threshold is smaller to divide
Section is thinner, and precision is higher, but corresponding shared register is more, and EMS memory occupation is bigger.Further, in one embodiment
In, above-mentioned preset threshold is 10mA~100mA.
Preferably, to combine the output accuracy of guarantee power supply chip and reducing EMS memory occupation, in one embodiment,
Setting preset threshold is 50mA.As shown in following table two, in the present embodiment, load current value is one according to every 50mA and is segmented
Section is divided into six different current segmentings, when load current value is within the scope of 0~50mA, adjusts pulse-modulated signal output
Duty ratio is 20%；When load current value is within the scope of 51~100mA, adjusting pulse-modulated signal output duty cycle is
30%；When load current value is within the scope of 101~150mA, adjusting pulse-modulated signal output duty cycle is 40%；Work as load
When current value is within the scope of 151~200mA, adjusting pulse-modulated signal output duty cycle is 50%；When load current value is 201
When within the scope of~250mA, adjusting pulse-modulated signal output duty cycle is 60%；When load current value is in 251~300mA range
When interior, adjusting pulse-modulated signal output duty cycle is 70%；Pulse-modulated signal output duty cycle increases with load current value
And it is incremented by.
Two current parameters look-up table of table
| Register | Load current (mA) | Duty ratio |
| 0x01 | 0~50 | 20% |
| 0x02 | 51~100 | 30% |
| 0x03 | 101~150 | 40% |
| 0x04 | 151~200 | 50% |
| 0x05 | 201~250 | 60% |
| 0x06 | 251~300 | 70% |
It should be noted that being about the corresponding output duty cycle of every section of load current value piecewise interval in the present embodiment
One embodiment, in practical application, the corresponding output duty cycle of the display panel of different type and model can difference, specifically
The corresponding output duty cycle of load current value piecewise interval is configured according to actual needs, and the present embodiment does not do specific limit
It is fixed.
In the present embodiment, by load current value subsection setup, the screen body load current value in same piecewise interval is corresponding
Pulse-modulated signal output duty cycle is identical, and power supply chip output is able to maintain load current increases and is stablized, is effectively ensured
The delivery efficiency of power supply chip, the delivery efficiency of power supply chip can be always held at 90% or more.Meanwhile even if load electricity
Stream reaches maximum load current 300mA and is even more than maximum load current, also can be according to the segment identifier where maximum load current
Between export corresponding duty ratio waveform, guarantee that power supply chip stablizes output, can effectively avoid conventional power source chip bright when screen body
Height is spent, when electric current needed for loading reaches maximum load current 300mA, power supply chip enters self-protection state, power supply chip
The problem of not working, influencing Display panel effect.
Above-mentioned power supply chip management system and method detect image to be displayed by microprocessor 100, obtain figure to be shown
The grayscale value of all pixels point of picture, and screen body load current value corresponding with image to be displayed is calculated according to grayscale value, according to
Load current value adjusts the output duty cycle of pulse modulation module 120 to adjust the output voltage of power supply chip 140.Above-mentioned power supply
The output duty cycle that chip management system adjusts pulse modulation module 120 by microprocessor 120 in real time adjusts power supply chip 140
Output voltage, make power supply chip 140 that can adjust in real time output voltage according to external loading, so that power supply chip 140 is maintained at
Optimal stable state, substantially increases the efficiency of power supply chip 140 under different loads, 140 stabilised efficiency of power supply chip, no
It is influenced by load current, can effectively ensure that oled panel display effect.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of power supply chip management system characterized by comprising microprocessor, pulse modulation module and power supply chip, institute
The input terminal for stating microprocessor is connect with display panel, the input of the output end of the microprocessor and the pulse modulation module
End connection, the output end of the pulse modulation module are connect with the input terminal of the power supply chip, the output of the power supply chip
End is connect with the display panel, and the microprocessor includes:
Image processing module obtains the grayscale value of each pixel of the image to be displayed for detecting image to be displayed；
Data memory module, for storing voltage parameter look-up table, the voltage parameter look-up table storage grayscale value and voltage
Corresponding relationship；
Data processing module obtains each pixel for searching voltage parameter look-up table according to the grayscale value of the pixel
Voltage calculates screen body load voltage according to the voltage of each pixel, and according to the screen body load voltage and display panel
Screen body impedance computation screen body load current value；And
Adjustment module is exported, for adjusting the output duty cycle of the pulse modulation module according to the screen body load current value,
Adjust the output voltage of the power supply chip.
2. power supply chip management system according to claim 1, which is characterized in that the power supply chip includes forward voltage
Output module and negative voltage output module, wherein
The forward voltage output module includes first switch tube and the first gate driver, the input terminal of first gate driver
Connect the output end of the pulse modulation module, the output end of first gate driver and the input terminal of the first switch tube
The output end of connection, the first switch tube connects the display panel, exports forward voltage to the display panel；
The negative voltage module includes second switch and the second gate driver；The input terminal of second gate driver connects
The output end of the pulse modulation module, the output end of second gate driver and the input terminal of the second switch connect
It connects, the output end of the second switch connects the display panel, exports negative voltage to the display panel；
The microprocessor by adjusting the output duty cycle of the pulse modulation module, thus adjust the first switch tube and
The switching frequency of the second switch, to adjust the forward voltage and the negative voltage that the power supply chip exports.
3. a kind of power supply chip management method, which comprises the following steps:
Image to be displayed is detected, the grayscale value of each pixel of the image to be displayed is obtained；
Voltage parameter look-up table is searched according to the grayscale value of the pixel, obtains the voltage of each pixel；The voltage parameter
The corresponding relationship of look-up table storage grayscale value and voltage；
Screen body load voltage is calculated according to the voltage of each pixel, and according to the screen body load voltage and display panel
Shield body impedance computation screen body load current value；
The output voltage of power supply chip is adjusted according to the output duty cycle that the screen body load current value adjusts pulse-modulated signal.
4. power supply chip management method according to claim 3, which is characterized in that the voltage parameter look-up table storage is more
A preset ties up a grayscale value, and each preset ties up the corresponding voltage of a grayscale value, and described preset of adjacent two ties up a grayscale value
Respectively first ties up a grayscale value and second ties up a grayscale value, described first tie up a grayscale value and described second tie up a grayscale value it
Between be spaced it is several it is non-tie up a grayscale value, tie up a grayscale value and described second described first and tie up between a grayscale value, each grayscale value
Corresponding voltage and grayscale value are in a linear relationship.
5. power supply chip management method according to claim 4, which is characterized in that positioned at described first tie up a grayscale value and
The second non-corresponding voltage of a grayscale value of tying up tied up between a grayscale value is calculated by the following formula to obtain:
Wherein, A1A grayscale value, A are tied up for first2A grayscale value, A are tied up for secondiIt is tied up to tie up a grayscale value and second positioned at first
Non- a grayscale value, A are tied up between point grayscale value1<Ai<A2；U1The corresponding voltage of a grayscale value, U are tied up for first2An ash is tied up for second
Rank is worth corresponding voltage.
6. power supply chip management method according to claim 3, which is characterized in that described according to the screen body load current
Value adjust pulse-modulated signal output duty cycle adjust power supply chip output voltage the step of include:
Current parameters look-up table is searched according to the screen body load current value, obtains the corresponding pulse of the screen body load current value
Modulated signal output duty cycle；The current parameters look-up table stores the screen body load current value and pulse-modulated signal exports
The corresponding relationship of duty ratio；
The switching frequency of the switching tube of the power supply chip is adjusted, according to the pulse-modulated signal output duty cycle to adjust
State the output voltage of power supply chip.
7. power supply chip management method according to claim 6, which is characterized in that the pulse-modulated signal exports duty
Increase than increasing with the screen body load current value.
8. power supply chip management method according to claim 6, which is characterized in that the screen body load current value is with default
Threshold segmentation is arranged, and the corresponding pulse-modulated signal output duty cycle of screen body load current value in same piecewise interval is identical.
9. the screen body load voltage is each picture according to claim 3 to 8 described in any item power supply chip management methods
The average voltage of the voltage of vegetarian refreshments.
10. power supply chip management method according to claim 9, which is characterized in that the voltage include forward voltage and
Negative voltage.
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| CN107731165B (en) * | 2017-11-27 | 2019-07-26 | 合肥鑫晟光电科技有限公司 | A kind of current control method and its device |
| CN108665849B (en) * | 2018-05-03 | 2020-04-10 | 武汉精测电子集团股份有限公司 | Method and device based on multi-group gamma regulation and dynamic power supply regulation |
| CN109740519B (en) * | 2018-12-29 | 2021-08-13 | 联想(北京)有限公司 | Control method and electronic device |
| CN111341268A (en) * | 2020-04-13 | 2020-06-26 | 京东方科技集团股份有限公司 | Display driving circuit, display driving method and device |
| CN112967683A (en) * | 2021-02-09 | 2021-06-15 | 上海天马有机发光显示技术有限公司 | Power supply control method, power supply control chip, display panel and display device |
| CN116508093A (en) * | 2021-11-26 | 2023-07-28 | 京东方科技集团股份有限公司 | Driving circuit of display panel, driving method of driving circuit and display device |
| CN115035874B (en) * | 2022-07-21 | 2023-08-25 | 硅谷数模(苏州)半导体股份有限公司 | Method for adjusting output electric signal of power management chip and screen driving board |
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