CN109215567A - display driving method and device - Google Patents
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- CN109215567A CN109215567A CN201811339610.9A CN201811339610A CN109215567A CN 109215567 A CN109215567 A CN 109215567A CN 201811339610 A CN201811339610 A CN 201811339610A CN 109215567 A CN109215567 A CN 109215567A
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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]
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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]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
Abstract
The present invention discloses a kind of display driving method and device, comprising: obtains the grayscale maximum value at least a line video data；Set the grayscale maximum value to the maximum load potentiometer numerical value of N of corresponding row；The maximum load voltage of the corresponding row is exported based on maximum load potentiometer numerical value of N control DAC.The present invention is using the maximum load potentiometer numerical value of N in a line as the grayscale maximum value in the video data of current row, rather than the prior art is fixed value N=2 like thatVideo_B- 1, maximum load voltage, that is, RAMP DAC of the RAMP DAC output in a line climbs to ceiling voltage by the grayscale Maximum constraint in the video data of current row, to substantially reduce the power consumption of RAMP DAC.
Description
Technical field
The present invention relates to display technology and field of image processings more particularly to field of display driving.
Background technique
Traditional display technology is typically based on analog-driven mode and carries out display control to pixel unit.For example, in Fig. 1,
Source driving method uses an independent RAMP DAC module, and generating one has linear relationship with on-load voltage count value cnt
Positive ramp voltage, the relationship of maximum load potentiometer numerical value of N and pixel array inputting video data bit wide Video_B are as follows:
N=2Video_B- 1, if the bit wide Video_B of inputting video data is 10, maximum load potentiometer numerical value of N is 1023.Fig. 2
For specific timing diagram, wherein CLK is RAMP DAC internal clocking, and EN is RAMP DAC enable signal, and cnt is that RAMP DAC is patrolled
Control unit clock count value, that is, on-load voltage count value is collected, VDAC is that RAMP DAC exports ramp voltage value.According to comparator
Compare the grayscale value of video data respective pixel unit and the on-load voltage count value cnt of RAMP DAC, control pixel unit adds
Carry the end time of ramp voltage VDAC.Such method can effectively reduce the area and industry manufacture difficulty of analog circuit, but
In video or image display process, there is a situation where that the regional area brightness in multiple image or a frame image is very low, i.e.,
The grayscale maximum value of multirow pixel unit is far smaller than maximum load potentiometer numerical value of N in multiple image or a frame image, but
RAMP DAC still needs to climbing to the corresponding ceiling voltage of maximum load potentiometer numerical value of N, considerably increases the power consumption of RAMP DAC.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of display driving method and device, utilize maximum load electricity
It presses the RAMP DAC of dynamically changeable to realize, under the premise of not reducing display effect, can be effectively reduced the function of display driving
Consumption.
In order to solve the above technical problems, the present invention adopts the following technical solutions.
A kind of display driving method, comprising the following steps:
Obtain the grayscale maximum value in at least video data of a line；
Set the grayscale maximum value to the maximum load potentiometer numerical value of N of corresponding row；
The maximum load voltage of corresponding row is exported based on maximum load potentiometer numerical value of N control DAC.
The method for obtaining the grayscale maximum value are as follows:
When behavior single channel:
Set the first data in the video data of a line to the current candidate grayscale maximum value of a line, a line
Video data include multiple data, the single pass video data of a line is the video data of a line；
To be removed in the video data of the current candidate grayscale maximum value and a line of a line by comparator should
Other data outside first data of a line compare；
If other described data of a line be respectively less than or equal to a line the current candidate grayscale maximum value,
The current candidate grayscale maximum value of a line is the grayscale maximum value of a line；
When behavior multichannel:
The first data in the video data in each channel in a line are respectively set to the corresponding channel of a line
Current candidate grayscale maximum value, the video data in each channel include multiple data；
It is by comparator that the current candidate grayscale maximum value of the corresponding channel of a line is corresponding with a line
Other data in the video data in channel in addition to first data of the corresponding channel of a line compare；
If other described data of the corresponding channel of a line respectively less than or described in the corresponding channel equal to a line are worked as
Preceding candidate grayscale maximum value, then the maximum value in the current candidate grayscale maximum value of the corresponding channel of a line is to be somebody's turn to do
The grayscale maximum value of a line；
Alternatively, first data of any one data as a line are selected in the video data in whole channels of a line,
Set the first selected data to the current candidate grayscale maximum value of a line, the video data in the whole channel includes more
A data；By comparator by the video counts in whole channels of the current candidate grayscale maximum value and a line of a line
Compare according to interior other data in addition to first data of a line；If other described data of a line are respectively less than or are equal to
The current candidate grayscale maximum value of a line, then the current candidate grayscale maximum value of a line is a line
The grayscale maximum value.
If one second data for comparing to obtain other data of the corresponding channel of described a line or described a line are greater than
The current candidate grayscale maximum value of the corresponding channel of a line or a line, then it is logical with the correspondence of a line or a line
The candidate grayscale maximum value that next time compares of second data in road as the corresponding channel of a line or described a line.
Described a line or other data in channel are the follow-up data of first data in a line or channel.
A kind of display drive apparatus, comprising:
Acquiring unit is used to obtain the grayscale maximum value in at least video data of a line；
Setting unit is used to set the grayscale maximum value to the maximum load potentiometer numerical value of N of corresponding row；
Logic control element is used to control the corresponding row of DAC output based on the maximum load potentiometer numerical value of N most
Big on-load voltage.
The acquiring unit is for obtaining the grayscale maximum value specifically:
When behavior single channel:
Set the first data in the video data of a line to the current candidate grayscale maximum value of a line, a line
Video data include multiple data, the single pass video data of a line is the video data of a line；
To be removed in the video data of the current candidate grayscale maximum value and a line of a line by comparator should
Other data outside first data of a line compare；
If other described data of a line be respectively less than or equal to a line the current candidate grayscale maximum value,
The current candidate grayscale maximum value of a line is the grayscale maximum value of a line；
When behavior multichannel:
The first data in the video data in each channel in a line are respectively set to the corresponding channel of a line
Current candidate grayscale maximum value, the video data in each channel include multiple data；
It is by comparator that the current candidate grayscale maximum value of the corresponding channel of a line is corresponding with a line
Other data in the video data in channel in addition to first data of the corresponding channel of a line compare；
If other described data of the corresponding channel of a line respectively less than or described in the corresponding channel equal to a line are worked as
Preceding candidate grayscale maximum value, then the maximum value in the current candidate grayscale maximum value of the corresponding channel of a line is to be somebody's turn to do
The grayscale maximum value of a line；
Alternatively, first data of any one data as a line are selected in the video data in whole channels of a line,
Set the first selected data to the current candidate grayscale maximum value of a line, the video data in the whole channel includes more
A data；By comparator by the video counts in whole channels of the current candidate grayscale maximum value and a line of a line
Compare according to interior other data in addition to first data of a line；If other described data of a line are respectively less than or are equal to
The current candidate grayscale maximum value of a line, then the current candidate grayscale maximum value of a line is a line
The grayscale maximum value.
If one second data for comparing to obtain other data of the corresponding channel of described a line or described a line are greater than
The current candidate grayscale maximum value of the corresponding channel of a line or a line, then it is logical with the correspondence of a line or a line
The candidate grayscale maximum value that next time compares of second data in road as the corresponding channel of a line or described a line.
Described a line or other data in channel are the follow-up data of first data in a line or channel.
The on-load voltage count value cnt of logic control element output according to DAC internal clocking CLK be increased stepwise to
Maximum load potentiometer numerical value of N, cnt meet relational expression: cnt≤N≤2Video_B- 1, wherein Video_B is inputting video data
Bit wide.
The present invention has following advantageous effects.
The present invention sets the grayscale maximum value in the video data of a line to the maximum load voltage count value of a line
N, i.e., the maximum load potentiometer numerical value of N in a line is the grayscale maximum value in the video data of current row, rather than the prior art
It is like that fixed value N=2Video_B- 1, maximum load voltage, that is, RAMP DAC of the RAMP DAC output in a line climbs to most
High voltage is by the grayscale Maximum constraint in the video data of current row, to substantially reduce the power consumption of RAMP DAC.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the source the OLED driving method of an existing DAC RAMP.
Fig. 2 is the pass of the source OLED the driving method output voltage values and on-load voltage count value of an existing DAC RAMP
It is schematic diagram.
Fig. 3 is a kind of structural schematic diagram of monochromatic display driving system of the invention.
Fig. 4 is the Row line output voltage value of Fig. 3 shown device and the relation schematic diagram of on-load voltage count value.
Fig. 5 is the Row+1 line output voltage value of Fig. 3 shown device and the relation schematic diagram of on-load voltage count value.
Fig. 6 is a kind of structural schematic diagram of colored display driving system.
Fig. 7 is the Row line output voltage value of Fig. 6 shown device and the relation schematic diagram of on-load voltage count value.
Fig. 8 is the Row+1 line output voltage value of Fig. 6 shown device and the relation schematic diagram of on-load voltage count value.
Fig. 9 is the flow diagram of the method for the present invention.
Figure 10 is a kind of structural schematic diagram of display drive apparatus of the invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.?
In the case where not conflicting, the feature in embodiment and embodiment in the present invention can mutual any combination.Although also, flowing
Logical order is shown in journey figure, but in some cases, it can be to be different from shown or described by sequence execution herein
The step of.
Present invention may apply to but be not limited to LCD, OLED, QLCD, QLED, Mini-LED, Micro-LED, Nano-
The display devices such as LED and Micro-OLED, equipment etc..
Pixel array of the present invention includes several pixel units, these pixel units are arranged in a matrix to be formed
Row × Column pixel array, wherein Row is line number, and Column is columns.The row number of Row × Column pixel array
Value range be 1,2 ..., Row, column compile value range be 1,2 ..., Column.
Such as Fig. 9, a kind of display driving method of the invention, comprising the following steps:
S1 obtains the grayscale maximum value in at least video data of a line；
S2 sets the grayscale maximum value to the maximum load potentiometer numerical value of N of corresponding row；
S3 exports the maximum load voltage of corresponding row based on maximum load potentiometer numerical value of N control DAC.
When behavior single channel, the present invention provides a kind of method of above-mentioned acquisition grayscale maximum value are as follows:
Set the first data in the video data of a line to the current candidate grayscale maximum value of a line, a line
Video data include multiple data, the single pass video data of a line is the video data of a line；
To be removed in the video data of the current candidate grayscale maximum value and a line of a line by comparator should
Other data outside first data of a line compare；
If other described data of a line be respectively less than or equal to a line the current candidate grayscale maximum value,
The current candidate grayscale maximum value of a line is the grayscale maximum value of a line.
When behavior multichannel, the present invention provides a kind of method of above-mentioned acquisition grayscale maximum value are as follows:
The first data in the video data in each channel in a line are respectively set to the corresponding channel of a line
Current candidate grayscale maximum value, the video data in each channel include multiple data；
It is by comparator that the current candidate grayscale maximum value of the corresponding channel of a line is corresponding with a line
Other data in the video data in channel in addition to first data of the corresponding channel of a line compare；
If other described data of the corresponding channel of a line respectively less than or described in the corresponding channel equal to a line are worked as
Preceding candidate grayscale maximum value, then the maximum value in the current candidate grayscale maximum value of the corresponding channel of a line is to be somebody's turn to do
The grayscale maximum value of a line.
Alternatively, the present invention also provides a kind of methods of above-mentioned acquisition grayscale maximum value when behavior multichannel are as follows:
First data of any one data as a line are selected in the video data in whole channels of a line, it will be selected
The first data be set as the current candidate grayscale maximum value of a line, the video data in the whole channel includes multiple numbers
According to；It will be in the video data in whole channels of the current candidate grayscale maximum value and a line of a line by comparator
Other data in addition to first data of a line compare；If other described data of a line be respectively less than or be equal to this one
The capable current candidate grayscale maximum value, then the current candidate grayscale maximum value of a line is the described of a line
Grayscale maximum value.
As it can be seen that the single pass grayscale maximum value of the row is the grayscale maximum value of the row when behavior single channel.Work as behavior
When multichannel, the maximum value in the grayscale maximum value of the multichannel of the row is the grayscale maximum value or the row multichannel of the row
Maximum value in all grayscale values is the grayscale maximum value of the row.
If one second data for comparing to obtain other data of the corresponding channel of described a line or described a line are greater than
The current candidate grayscale maximum value of the corresponding channel of a line or a line, then it is logical with the correspondence of a line or a line
The candidate grayscale maximum value that next time compares of second data in road as the corresponding channel of a line or described a line.
A line or other data in channel are the follow-up data of first data in a line or channel.
Figure 10 is participated in, a kind of display drive apparatus 1 of the invention includes acquiring unit 11, setting unit 12, logic control
Unit 13.
Acquiring unit 11 is used to obtain the grayscale maximum value in at least video data of a line；
Setting unit 12 is used to set the grayscale maximum value to the maximum load potentiometer numerical value of N of corresponding row；
Logic control element 13 is used to export the maximum of corresponding row based on maximum load potentiometer numerical value of N control DAC
On-load voltage.For example, logic control element 13 is RAMP DAC logic control element, the on-load voltage count value cnt of output
It is increased stepwise according to DAC internal clocking CLK to maximum load potentiometer numerical value of N, cnt meets relational expression: cnt≤N≤2Video_B-
1, wherein Video_B is the bit wide of inputting video data.
In some embodiments, when behavior single channel, acquiring unit 11 is for obtaining grayscale maximum value specifically:
Set the first data in the video data of a line to the current candidate grayscale maximum value of a line, a line
Video data include multiple data, the single pass video data of a line is the video data of a line；
To be removed in the video data of the current candidate grayscale maximum value and a line of a line by comparator should
Other data outside first data of a line compare；
If other described data of a line be respectively less than or equal to a line the current candidate grayscale maximum value,
The current candidate grayscale maximum value of a line is the grayscale maximum value of a line.
In some embodiments, when behavior multichannel, acquiring unit 11 is for obtaining grayscale maximum value specifically:
The first data in the video data in each channel in a line are respectively set to the corresponding channel of a line
Current candidate grayscale maximum value, the video data in each channel include multiple data；
It is by comparator that the current candidate grayscale maximum value of the corresponding channel of a line is corresponding with a line
Other data in the video data in channel in addition to first data of the corresponding channel of a line compare；
If other described data of the corresponding channel of a line respectively less than or described in the corresponding channel equal to a line are worked as
Preceding candidate grayscale maximum value, then the maximum value in the current candidate grayscale maximum value of the corresponding channel of a line is to be somebody's turn to do
The grayscale maximum value of a line.
Alternatively, acquiring unit 11 is for obtaining grayscale maximum value also when behavior multichannel specifically:
First data of any one data as a line are selected in the video data in whole channels of a line, it will be selected
The first data be set as the current candidate grayscale maximum value of a line, the video data in the whole channel includes multiple numbers
According to；It will be in the video data in whole channels of the current candidate grayscale maximum value and a line of a line by comparator
Other data in addition to first data of a line compare；If other described data of a line be respectively less than or be equal to this one
The capable current candidate grayscale maximum value, then the current candidate grayscale maximum value of a line is the described of a line
Grayscale maximum value.
In some embodiments, if comparing other data for obtaining the corresponding channel of described a line or described a line
One second data are greater than the current candidate grayscale maximum value of the corresponding channel of a line or a line, then with a line or
The time that next time compares of second data of the corresponding channel of a line as the corresponding channel of a line or described a line
Select grayscale maximum value.
In some embodiments in the present invention, other data in described a line or channel are a line or the institute in channel
State the follow-up data of the first data.
It illustrates below and the present invention is further explained.
(1) input single channel video data carries out monochromatic display
Together referring to Fig. 3,10, one of monochromatic display driving system of the present invention uses maximum load electricity
The RAMP DAC of dynamically changeable is pressed to realize display driving, wherein data comparand register constitutes acquiring unit 11, and load extreme value is posted
Storage constitutes setting unit 12, RAMP DAC logic control element includes logic control element 13.
Display drive apparatus 1 includes data comparand register, load extreme value register and RAMP DAC logic control element.
Data comparand register is used to obtain the grayscale maximum value in the single channel video data at least a line.Specifically
, set the first data in the video data of a line to the current candidate grayscale maximum value of a line, the view of a line
For frequency according to including multiple data, the single pass video data of a line is the video data of a line；It will by comparator
In the video data of the current candidate grayscale maximum value and a line of a line in addition to first data of a line
Other data compare；If other described data of a line be respectively less than or equal to a line the current candidate grayscale most
Big value, then the current candidate grayscale maximum value of a line is the grayscale maximum value of a line.For example, by the 1st row
In single channel video data in the first data of the 1st row be set as the current candidate grayscale maximum value of the 1st row, the 1st
The video data of single channel in row includes multiple data；By comparator by the current candidate grayscale of the 1st row most
Big value is compared with other data in the video data of the single channel in the 1st row in addition to first data of the 1st row；If the
Other described data of 1 row be respectively less than or equal to the 1st row the current candidate grayscale maximum value, then the 1st the described of row is worked as
Preceding candidate grayscale maximum value is the grayscale maximum value of the 1st row.If comparing to obtain the one second of other data of the 1st row
Data are greater than the current candidate grayscale maximum value of the 1st row, then using second data of the 1st row as the 1st row under
The candidate grayscale maximum value once compared.Comparison of other rows and so on.
Load extreme value register is for storing the grayscale maximum value for corresponding to row in single channel video data, as corresponding row
Maximum load potentiometer numerical value of N, and RAMP DAC logic control element is fed back to, RAMP DAC logic control element is according to maximum
On-load voltage count value N controls the maximum load voltage of the corresponding row of output of RAMP DAC.
For example, video data is Column column, data bit width Video_B when input one frame/field single channel video data
Position, wherein the grayscale value range of Row row video data is [Mono1, Mono2], the grayscale value of Row+1 row video data
Range is [Mono3, Mono4], then source driving carries out the step of Row row and Row+1 row are shown and includes:
It is one that shift register, which generates width in the lowest order of shift register according to video data useful signal DE,
The pulse of VCLK, and successively to the high position transmitting of shift register, wherein VCLK is the pixel clock of source driving, and displacement is posted
The bit wide of storage is identical as the columns Column of pixel array.
It is loaded into register root and successively stores single channel video data according to the pulse significance bit in shift register to loading
In register, wherein the bit wide for being loaded into register is Video_B, and number is identical as the columns Column of pixel array.
First data of the Row row in single channel video data are minimum according to shift register for example as the first data
The effective impulse of position is stored into data comparand register, and the 2nd, 3 ... Column video datas are successively then made ratio therewith
Compared with, wherein Column is the columns of Row row video data, and data comparand register bit wide is Video_B, if it is greater than data
Value in comparand register then covers initial value, otherwise remains unchanged, and finally obtains maximum gray value Mono2.
When Row row video data full storage is relatively finished to register, concurrent video data comparand register is loaded into,
In the invalid gap of Row row video data, the Row row data being loaded onto register while it importeding into display register
In, while the Mono2 in video data comparand register being imported into load extreme value register, and data are compared into deposit
Device is reset.Then, repeat aforesaid operations when Row+1 row DE signal is effective, wherein the bit wide of display register is
Video_B, number is identical as the columns Column of pixel array, and load extreme value register bit wide is Video_B.
The Mono2 of load extreme value register storage as the maximum load potentiometer numerical value of N for corresponding to row and feeds back to RAMP
DAC logic control element, and then the maximum load voltage of RAMP DAC output is controlled, the video data in display register is simultaneously
It makes comparisons with on-load voltage count value cnt, the end time of control pixel unit load ramp voltage VDAC carries out the picture on basis
Plain unit grayscale is shown.Referring to fig. 4, Fig. 5, respectively a kind of display using RAMP DAC maximum load voltage dynamically changeable are driven
The Row row and Row+1 line output voltage value and the relationship of on-load voltage count value of the dynamic monochromatic display device of method progress show
It is intended to.
(2) input multichannel (specially R, G, B triple channel) video data carries out colored display
Referring to Fig. 6,10, a kind of colored display driving system of the invention uses maximum load voltage dynamically changeable
RAMP DAC realizes display driving, wherein R, G, channel B data comparand register constitute acquiring unit 11, load extreme value deposit
Device constitutes setting unit 12, and RAMP DAC logic control element includes logic control element 13.
Display drive apparatus 1 includes R, G, channel B data comparand register, load extreme value register and RAMP DAC logic
Control unit, R, G, channel B video data are corresponding to be somebody's turn to do for being respectively compared in a line for R, G, channel B data comparand register
The grayscale maximum value of capable R, G, channel B, load extreme value register are used to store the maximum value conduct in the grayscale maximum value
The maximum load potentiometer numerical value of N of corresponding row simultaneously feeds back to RAMP DAC logic control element, and then controls RAMP DAC output
Maximum load voltage.
When input one frame/field R, G, B three-channel video data, video data is Column column, data bit width Video_B
Position, wherein R, G of Row row video data, the grayscale value range of channel B be respectively [Color_R1, Color_R2],
[Color_G1, Color_G2], [Color_B1, Color_B2], the grayscale value of R, G of Row+1 row video data, channel B
Range is [Color_R3, Color_R4], [Color_G3, Color_G4], [Color_B3, Color_B4], and Color_
The maximum value of R2, Color_G2, Color_B2 are Color2, and the maximum value of Color_R4, Color_G4, Color_B4 are
Color4, then source driving carry out the step of Row row and Row+1 row are shown and include:
It is one that shift register, which generates width in the lowest order of shift register according to video data useful signal DE,
The pulse of VCLK, and successively to the high position transmitting of shift register, wherein VCLK is the pixel clock of source driving, and displacement is posted
The bit wide Video_B of storage and the columns Column of pixel array are identical.
R, G, channel B be loaded into register root according to the pulse significance bit in shift register by R, G, channel B video data according to
It is secondary storage to R, G, channel B be loaded into register in, wherein R, G, channel B be loaded into register bit wide be Video_B, number with
The columns Column of pixel array is identical.
First R, G of the Row row in three-channel video data, channel B data have according to shift register lowest order
Effect pulse is stored into R, G, channel B data comparand register, then successively by the 2nd, 3 ... Column R, G, channel B video
Data are made comparisons therewith, and R, G, B channel data comparand register bit wide are Video_B, if it is greater than R, G, channel B data ratio
Compared with the value in register, then initial value is covered, is otherwise remained unchanged, finally respectively obtains maximum gray value Color_R2, Color_
G2,Color_B2.R, the specific method that G, channel B obtain the grayscale maximum value in a line in corresponding channel video data respectively is asked
Participate in the specific method that the 1st row in " (1) inputs single channel video data and carries out monochromatic display " above obtains grayscale maximum value.
When R, G, channel B Row row video data full storage to R, G, channel B are loaded into register, while R, G, channel B
Data comparand register relatively finishes, and in the invalid gap of Row row video data, R, G, channel B are loaded into register
Row row data imported into R, G, in channel B display register simultaneously, while will be in R, G, channel B data comparand register
The maximum value Color2 (i.e. the grayscale maximum value that Color2 is Row row) of Color_R2, Color_G2, Color_B2 are imported
It is reset into load extreme value register, and by R, G, channel B data comparand register.Then, when Row+1 row DE signal has
Repeat aforesaid operations when effect, wherein R, G, channel B display register bit wide be Video_B, number and pixel array
Columns Column is identical, and load extreme value register bit wide is Video_B.
The Color2 of load extreme value register storage as the maximum load potentiometer numerical value of N for corresponding to row and feeds back to RAMP
DAC logic control element, and then control the maximum load voltage of RAMP DAC output, the view in R, G, channel B display register
For frequency according to making comparisons simultaneously with on-load voltage count value cnt, control pixel unit loads the end time of ramp voltage VDAC, into
The pixel unit grayscale on row basis is shown.It is respectively a kind of to use RAMP DAC maximum load voltage dynamic referring to Fig. 7, Fig. 8
The display driving method of change carries out the Row row of colour display device and Row+1 line output voltage value is counted with on-load voltage
The relation schematic diagram of value.
It, can be unlike respectively obtaining the maximum gray of corresponding channel in Row row above for the situation of multichannel
Value Color_R2, Color_G2, Color_B2, then compare again size will wherein maximum value Color2 as corresponding row i.e. the
The grayscale maximum value of Row row, for example, any one data can be selected in a line such as video data in whole channels of the 2nd row
As the first data of a line such as the 2nd row, a line i.e. current candidate of the 2nd row is set by the first selected data
Grayscale maximum value, the video data of the 2nd row multichannel include multiple data, will be described in a line i.e. the 2nd row by comparator
In current candidate grayscale maximum value and a line i.e. the 2nd row video data in addition to a line i.e. first data of the 2nd row
Other data compare, if a line i.e. other described data of the 2nd row be respectively less than or work as equal to described in a line i.e. the 2nd row
Preceding candidate grayscale maximum value, then the current candidate grayscale maximum value of i.e. the 2nd row of a line is i.e. the 2nd row of a line
The grayscale maximum value.If one second data for comparing to obtain other data of the 2nd row are greater than the described current of the 2nd row
Candidate grayscale maximum value, then using second data of the 2nd row as the candidate grayscale maximum value of the 2nd row compared next time.
Comparison of other rows and so on.
The ramp voltage and on-load voltage count value cnt of RAMP DAC output are linear.
In the case where the step values of RAMP DAC output on-load voltage are constant, maximum load potentiometer numerical value of N is smaller,
It is smaller that RAMP DAC exports maximum load voltage.
In embodiment provided by the present invention, it should be understood that disclosed device and method can pass through others
Mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another device, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of device or unit
It connects, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, it can be located at
One place, or may be distributed over multiple network units.Can select according to the actual needs part therein or
Whole units achieve the purpose of the solution of this embodiment.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
It is each that equipment (can be personal computer, server or the network equipment etc.) or processor (processor) execute the present invention
The all or part of the steps of embodiment the method.And storage medium/unit above-mentioned includes: general serial bus USB
(Universal Serial Bus flash disk), mobile hard disk, read-only memory (Read-Only Memory, ROM),
Random access memory (Random Access Memory, RAM), magnetic or disk etc. be various to can store program code
Medium.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of display driving method, which comprises the following steps:
Obtain the grayscale maximum value in at least video data of a line；
Set the grayscale maximum value to the maximum load potentiometer numerical value of N of corresponding row；
The maximum load voltage of corresponding row is exported based on maximum load potentiometer numerical value of N control DAC.
2. display driving method according to claim 1, which is characterized in that the method for obtaining the grayscale maximum value are as follows:
When behavior single channel:
Set the first data in the video data of a line to the current candidate grayscale maximum value of a line, the view of a line
For frequency according to including multiple data, the single pass video data of a line is the video data of a line；
By comparator a line will be removed in the video data of the current candidate grayscale maximum value and a line of a line
First data outside other data compare；
If other described data of a line be respectively less than or equal to a line the current candidate grayscale maximum value, this one
The capable current candidate grayscale maximum value is the grayscale maximum value of a line；
When behavior multichannel:
The first data in the video data in each channel in a line are respectively set to the current of the corresponding channel of a line
Candidate grayscale maximum value, the video data in each channel includes multiple data；
By comparator by the corresponding channel of current candidate the grayscale maximum value and a line of the corresponding channel of a line
Video data in other data in addition to first data of the corresponding channel of a line compare；
If other described data of the corresponding channel of a line are respectively less than or described current equal to the corresponding channel of a line
Candidate grayscale maximum value, then the maximum value in the current candidate grayscale maximum value of the corresponding channel of a line is a line
The grayscale maximum value；
Alternatively, first data of any one data as a line are selected in the video data in whole channels of a line, by institute
First data of choosing are set as the current candidate grayscale maximum value of a line, and the video data in the whole channel includes multiple numbers
According to；It will be in the video data in whole channels of the current candidate grayscale maximum value and a line of a line by comparator
Other data in addition to first data of a line compare；If other described data of a line be respectively less than or be equal to this one
The capable current candidate grayscale maximum value, then the current candidate grayscale maximum value of a line is the described of a line
Grayscale maximum value.
3. display driving method according to claim 2, which is characterized in that if comparing to obtain described a line or described a line
Corresponding channel other data one second data be greater than a line or a line corresponding channel it is described current
Candidate grayscale maximum value, then using second data of the corresponding channel of a line or a line as a line or described a line
Corresponding channel the candidate grayscale maximum value compared next time.
4. display driving method according to claim 2, which is characterized in that described a line or other data in channel
For the follow-up data of a line or first data in channel.
5. a kind of display drive apparatus characterized by comprising
Acquiring unit is used to obtain the grayscale maximum value in at least video data of a line；
Setting unit is used to set the grayscale maximum value to the maximum load potentiometer numerical value of N of corresponding row；
Logic control element is used to control the maximum load that DAC exports corresponding row based on the maximum load potentiometer numerical value of N
Voltage.
6. display drive apparatus according to claim 5, which is characterized in that the acquiring unit is for obtaining the grayscale
Maximum value specifically:
When behavior single channel:
Set the first data in the video data of a line to the current candidate grayscale maximum value of a line, the view of a line
For frequency according to including multiple data, the single pass video data of a line is the video data of a line；
By comparator a line will be removed in the video data of the current candidate grayscale maximum value and a line of a line
First data outside other data compare；
If other described data of a line be respectively less than or equal to a line the current candidate grayscale maximum value, this one
The capable current candidate grayscale maximum value is the grayscale maximum value of a line；
When behavior multichannel:
The first data in the video data in each channel in a line are respectively set to the current of the corresponding channel of a line
Candidate grayscale maximum value, the video data in each channel includes multiple data；
By comparator by the corresponding channel of current candidate the grayscale maximum value and a line of the corresponding channel of a line
Video data in other data in addition to first data of the corresponding channel of a line compare；
If other described data of the corresponding channel of a line are respectively less than or described current equal to the corresponding channel of a line
Candidate grayscale maximum value, then the maximum value in the current candidate grayscale maximum value of the corresponding channel of a line is a line
The grayscale maximum value；
Alternatively, first data of any one data as a line are selected in the video data in whole channels of a line, by institute
First data of choosing are set as the current candidate grayscale maximum value of a line, and the video data in the whole channel includes multiple numbers
According to；It will be in the video data in whole channels of the current candidate grayscale maximum value and a line of a line by comparator
Other data in addition to first data of a line compare；If other described data of a line be respectively less than or be equal to this one
The capable current candidate grayscale maximum value, then the current candidate grayscale maximum value of a line is the described of a line
Grayscale maximum value.
7. display drive apparatus according to claim 6, which is characterized in that if comparing to obtain described a line or described a line
Corresponding channel other data one second data be greater than a line or a line corresponding channel it is described current
Candidate grayscale maximum value, then using second data of the corresponding channel of a line or a line as a line or described a line
Corresponding channel the candidate grayscale maximum value compared next time.
8. display drive apparatus according to claim 6, which is characterized in that described a line or other data in channel
For the follow-up data of a line or first data in channel.
9. according to the described in any item display drive apparatus of claim 5-8, which is characterized in that the logic control element output
On-load voltage count value cnt be increased stepwise according to DAC internal clocking CLK to maximum load potentiometer numerical value of N, cnt, which meets, to close
It is formula: cnt≤N≤2Video_B- 1, wherein Video_B is the bit wide of inputting video data.
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