CN109215567B - Display driving method and device - Google Patents

Display driving method and device Download PDF

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Publication number
CN109215567B
CN109215567B CN201811339610.9A CN201811339610A CN109215567B CN 109215567 B CN109215567 B CN 109215567B CN 201811339610 A CN201811339610 A CN 201811339610A CN 109215567 B CN109215567 B CN 109215567B
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row
data
maximum value
channel
gray scale
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CN109215567A (en
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黎守新
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Chengdu Goldensi Technology Co ltd
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Chengdu Goldensi Technology Co ltd
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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]
    • 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 invention discloses a display driving method and a display driving deviceThe method comprises the following steps: acquiring a gray scale maximum value in at least one line of video data; setting the maximum gray scale value as the maximum loading voltage count value N of the corresponding row; and controlling the DAC to output the maximum loading voltage of the corresponding row based on the maximum loading voltage count value N. The invention takes the maximum loading voltage counting value N in one line as the maximum value of the gray scale in the video data of the line, rather than the fixed value N of 2 in the prior artVideo_B-1, the maximum loading voltage output by the RAMP DACs in a row, i.e. the RAMP DACs RAMP up to the highest voltage, is controlled by the maximum value of the gray scale in the video data of the row, thereby greatly reducing the power consumption of the RAMP DACs.

Description

Display driving method and device
Technical Field
The present invention relates to the field of display technology and image processing, and in particular to the field of display driving.
Background
In a conventional display technology, display control is usually performed on a pixel unit based on an analog driving method. For example, in fig. 1, the source driving method adopts an independent RAMP DAC module to generate a forward RAMP voltage having a linear relationship with the loading voltage count value cnt, and the relationship between the maximum loading voltage count value N and the pixel array input Video data bit width Video _ B is as follows: n is 2Video_B1, if the bit width Video _ B of the input Video data is 10 bits, the maximum loading voltage count value N is 1023. Fig. 2 is a specific timing diagram, where CLK is the RAMP DAC internal clock, EN is the RAMP DAC enable signal, cnt is the RAMP DAC logic control unit clock count value, i.e., the load voltage count value, and VDAC is the RAMP DAC output voltage value. And controlling the termination time of the pixel unit loading the RAMP voltage VDAC according to the comparison between the gray-scale value of the pixel unit corresponding to the video data and the loading voltage count value cnt of the RAMP DAC by the comparator. The method can effectively reduce the area of the analog circuit and the industrial manufacturing difficulty, but in the process of displaying videos or images, the condition that the brightness of a local area in a multi-frame image or a frame of image is very low exists, namely the maximum gray scale value of a plurality of rows of pixel units in the multi-frame image or the frame of image is far smaller than the maximum loading voltage count value N, but the RAMP DAC still needs to climb to the highest voltage corresponding to the maximum loading voltage count value N, and the power consumption of the RAMP DAC is greatly increased.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a display driving method and device, which are implemented by using a RAMP DAC with a dynamically variable maximum loading voltage, and can effectively reduce the power consumption of display driving without reducing the display effect.
In order to solve the technical problems, the invention adopts the following technical scheme.
A display driving method comprising the steps of:
acquiring a gray scale maximum value in the video data of at least one line;
setting the maximum gray scale value as the maximum loading voltage count value N of the corresponding row;
and controlling the DAC to output the maximum loading voltage of the corresponding row based on the maximum loading voltage count value N.
The method for acquiring the maximum value of the gray scale comprises the following steps:
when behaving as a single channel:
setting first data in video data of a line as the maximum value of the current candidate gray scale of the line, wherein the video data of the line comprises a plurality of data, and the single-channel video data of the line is the video data of the line;
comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of the row through a comparator;
if the other data in the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row;
when the behavior is multi-channel:
respectively setting first data in the video data of each channel in a row as the current candidate gray scale maximum value of the corresponding channel in the row, wherein the video data of each channel comprises a plurality of data;
comparing the current candidate gray scale maximum value of the channel corresponding to the row with other data except the first data of the channel corresponding to the row in the video data of the channel corresponding to the row by a comparator;
if the other data of the corresponding channel of the row are all smaller than or equal to the current candidate gray scale maximum value of the corresponding channel of the row, the maximum value of the current candidate gray scale maximum values of the corresponding channel of the row is the gray scale maximum value of the row;
or selecting any data from the video data of all channels in a row as the first data of the row, and setting the selected first data as the current candidate gray scale maximum value of the row, wherein the video data of all channels comprises a plurality of data; comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of all the channels of the row by a comparator; and if the other data of the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row.
And if the second data of the other data of the corresponding channel of the row or the row is larger than the current candidate gray-scale maximum value of the corresponding channel of the row or the row, taking the second data of the corresponding channel of the row or the row as the candidate gray-scale maximum value of the next comparison of the corresponding channel of the row or the row.
The other data of the row or channel is subsequent data to the first data of the row or channel.
A display driving apparatus comprising:
an acquisition unit configured to acquire a maximum value of gray scale in video data of at least one line;
the setting unit is used for setting the maximum gray scale value as the maximum loading voltage count value N of the corresponding row;
a logic control unit for controlling the DAC to output the maximum load voltage of the corresponding row based on the maximum load voltage count value N.
The obtaining unit is configured to obtain the maximum grayscale value specifically as follows:
when behaving as a single channel:
setting first data in video data of a line as the maximum value of the current candidate gray scale of the line, wherein the video data of the line comprises a plurality of data, and the single-channel video data of the line is the video data of the line;
comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of the row through a comparator;
if the other data in the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row;
when the behavior is multi-channel:
respectively setting first data in the video data of each channel in a row as the current candidate gray scale maximum value of the corresponding channel in the row, wherein the video data of each channel comprises a plurality of data;
comparing the current candidate gray scale maximum value of the channel corresponding to the row with other data except the first data of the channel corresponding to the row in the video data of the channel corresponding to the row by a comparator;
if the other data of the corresponding channel of the row are all smaller than or equal to the current candidate gray scale maximum value of the corresponding channel of the row, the maximum value of the current candidate gray scale maximum values of the corresponding channel of the row is the gray scale maximum value of the row;
or selecting any data from the video data of all channels in a row as the first data of the row, and setting the selected first data as the current candidate gray scale maximum value of the row, wherein the video data of all channels comprises a plurality of data; comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of all the channels of the row by a comparator; and if the other data of the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row.
And if the second data of the other data of the corresponding channel of the row or the row is larger than the current candidate gray-scale maximum value of the corresponding channel of the row or the row, taking the second data of the corresponding channel of the row or the row as the candidate gray-scale maximum value of the next comparison of the corresponding channel of the row or the row.
The other data of the row or channel is subsequent data to the first data of the row or channel.
The loading voltage count value cnt output by the logic control unit is increased to the maximum loading voltage count value N according to the DAC internal clock CLK step by step, and the cnt meets the relation: n is not less than cnt and not more than 2Video_B-1, where Video _ B is the bit width of the input Video data.
The present invention has the following advantageous technical effects.
The invention sets the maximum value of gray scale in video data of one line as the maximum value of loading voltage count N of the line, namely the maximum value of loading voltage count N in one line is the maximum value of gray scale in video data of the line, and is not the fixed value N of 2 as the prior artVideo_B-1, the maximum loading voltage output by the RAMP DACs in a row, i.e. the RAMP DACs RAMP up to the highest voltage, is controlled by the maximum value of the gray scale in the video data of the row, thereby greatly reducing the power consumption of the RAMP DACs.
Drawings
Fig. 1 is a schematic structural diagram of an OLED source driving method of a DAC RAMP in the prior art.
Fig. 2 is a schematic diagram illustrating a relationship between an output voltage value and a loading voltage count value of a conventional DAC RAMP in an OLED source driving method.
FIG. 3 is a schematic diagram of a monochrome display driving system according to the present invention.
Fig. 4 is a diagram illustrating the relationship between the output voltage value of Row and the loading voltage count value of the apparatus shown in fig. 3.
FIG. 5 is a diagram illustrating the relationship between the output voltage value of Row Row +1 and the loading voltage count value of the apparatus shown in FIG. 3.
FIG. 6 is a schematic diagram of a color display driving system.
Fig. 7 is a diagram illustrating the relationship between the output voltage value of Row and the loading voltage count value of the device shown in fig. 6.
FIG. 8 is a diagram illustrating the relationship between the Row +1 Row output voltage value and the loading voltage count value of the device shown in FIG. 6.
FIG. 9 is a schematic flow chart of the method of the present invention.
Fig. 10 is a schematic structural diagram of a display driving device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The embodiments and features of the embodiments of the present invention may be arbitrarily combined with each other without conflict. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
The invention can be applied to, but not limited to, display devices, equipment and the like such as LCD, OLED, QLCD, QLED, Mini-LED, Micro-LED, Nano-LED, Micro-OLED and the like.
The pixel array comprises a plurality of pixel units, wherein the pixel units are arranged in a matrix mode to form a Row multiplied by Column pixel array, Row is the number of rows, and Column is the number of columns. Row × Column pixel array has Row numbers in the range of 1, 2, …, Row, and columns in the range of 1, 2, …, Column.
As shown in fig. 9, a display driving method of the present invention includes the steps of:
s1, acquiring the maximum gray scale value in the video data of at least one line;
s2, setting the maximum gray scale value as the maximum loading voltage count value N of the corresponding row;
and S3, controlling the DAC to output the maximum loading voltage of the corresponding row based on the maximum loading voltage counting value N.
When the behavior is a single channel, the invention provides a method for acquiring the maximum value of the gray scale, which comprises the following steps:
setting first data in video data of a line as the maximum value of the current candidate gray scale of the line, wherein the video data of the line comprises a plurality of data, and the single-channel video data of the line is the video data of the line;
comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of the row through a comparator;
and if the other data of the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row.
When the behavior is multi-channel, the invention provides a method for acquiring the maximum value of the gray scale, which comprises the following steps:
respectively setting first data in the video data of each channel in a row as the current candidate gray scale maximum value of the corresponding channel in the row, wherein the video data of each channel comprises a plurality of data;
comparing the current candidate gray scale maximum value of the channel corresponding to the row with other data except the first data of the channel corresponding to the row in the video data of the channel corresponding to the row by a comparator;
if the other data of the corresponding channel of the row are all smaller than or equal to the current candidate gray scale maximum value of the corresponding channel of the row, the maximum value of the current candidate gray scale maximum values of the corresponding channel of the row is the gray scale maximum value of the row.
Or, when the line is multi-channel, the invention further provides a method for acquiring the maximum value of the gray scale, which comprises the following steps:
selecting any data from the video data of all channels in a row as first data of the row, setting the selected first data as the current candidate gray scale maximum value of the row, wherein the video data of all channels comprises a plurality of data; comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of all the channels of the row by a comparator; and if the other data of the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row.
It can be seen that when a line is a single channel, the maximum gray scale value of the single channel of the line is the maximum gray scale value of the line. When the row is in multiple channels, the maximum value of the maximum gray scale values of the multiple channels of the row is the maximum gray scale value of the row or the maximum value of all the gray scale values of the multiple channels of the row is the maximum gray scale value of the row.
And if the second data of the other data of the corresponding channel of the row or the row is larger than the current candidate gray-scale maximum value of the corresponding channel of the row or the row, taking the second data of the corresponding channel of the row or the row as the candidate gray-scale maximum value of the next comparison of the corresponding channel of the row or the row.
Said other data of a row or channel is subsequent to said first data of that row or channel.
Referring to fig. 10, a display driving apparatus 1 of the present invention includes an acquisition unit 11, a setting unit 12, and a logic control unit 13.
The acquiring unit 11 is configured to acquire a maximum gray scale value in the video data of at least one line;
the setting unit 12 is configured to set the maximum gray scale value as the maximum loading voltage count value N of the corresponding row;
the logic control unit 13 is configured to control the DAC to output the maximum loading voltage of the corresponding row based on the maximum loading voltage count value N. For example, the logic control unit 13 is a RAMP DAC logic control unit, and the loading voltage count value cnt output by the logic control unit is increased to the maximum loading voltage count value N according to the DAC internal clock CLK, and cnt satisfies the following relation: n is not less than cnt and not more than 2Video_B-1, where Video _ B is the bit width of the input Video data.
In some embodiments, when the line is a single channel, the obtaining unit 11 is configured to obtain the maximum grayscale value as:
setting first data in video data of a line as the maximum value of the current candidate gray scale of the line, wherein the video data of the line comprises a plurality of data, and the single-channel video data of the line is the video data of the line;
comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of the row through a comparator;
and if the other data of the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row.
In some embodiments, when the line is multi-channel, the obtaining unit 11 is configured to obtain the maximum gray level specifically as:
respectively setting first data in the video data of each channel in a row as the current candidate gray scale maximum value of the corresponding channel in the row, wherein the video data of each channel comprises a plurality of data;
comparing the current candidate gray scale maximum value of the channel corresponding to the row with other data except the first data of the channel corresponding to the row in the video data of the channel corresponding to the row by a comparator;
if the other data of the corresponding channel of the row are all smaller than or equal to the current candidate gray scale maximum value of the corresponding channel of the row, the maximum value of the current candidate gray scale maximum values of the corresponding channel of the row is the gray scale maximum value of the row.
Alternatively, when the line is multi-channel, the obtaining unit 11 is further configured to obtain the maximum grayscale value as follows:
selecting any data from the video data of all channels in a row as first data of the row, setting the selected first data as the current candidate gray scale maximum value of the row, wherein the video data of all channels comprises a plurality of data; comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of all the channels of the row by a comparator; and if the other data of the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row.
In some embodiments, if a second data of the other data of the one row or the corresponding channel of the one row is greater than the current candidate gray-scale maximum value of the one row or the corresponding channel of the one row, the second data of the one row or the corresponding channel of the one row is used as a candidate gray-scale maximum value of a next comparison of the one row or the corresponding channel of the one row.
In some embodiments of the invention, the other data of the row or channel is subsequent to the first data of the row or channel.
The present invention will be further described below by way of examples.
(1) Inputting single-channel video data for monochrome display
Referring to fig. 3 and 10 together, the monochrome display driving system according to the present invention uses a RAMP DAC with a dynamically variable maximum loading voltage to realize display driving, wherein a data comparison register constitutes the obtaining unit 11, a loading extremum register constitutes the setting unit 12, and a RAMP DAC logic control unit includes a logic control unit 13.
The display driving apparatus 1 includes a data comparison register, a load extremum register, and a RAMP DAC logic control unit.
The data comparison register is used for acquiring the maximum gray scale value in the single-channel video data in at least one row. Specifically, the first data in the video data of one line is set as the maximum value of the current candidate gray scale of the one line, the video data of the one line comprises a plurality of data, and the single-channel video data of the one line is the video data of the one line; comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of the row through a comparator; and if the other data of the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row. For example, the first data in the 1 st line in the video data of the single channel in the 1 st line is set as the current candidate gray-scale maximum value in the 1 st line, and the video data of the single channel in the 1 st line includes a plurality of data; comparing the current candidate gray-scale maximum value of the 1 st line with other data except the first data of the 1 st line in the video data of the single channel in the 1 st line through a comparator; if the other data in the 1 st row are all smaller than or equal to the current candidate gray scale maximum value in the 1 st row, the current candidate gray scale maximum value in the 1 st row is the gray scale maximum value in the 1 st row. And if the comparison result shows that second data of the other data in the 1 st row is larger than the current candidate gray scale maximum value in the 1 st row, taking the second data in the 1 st row as the candidate gray scale maximum value in the next comparison in the 1 st row. Comparisons of other rows and so on.
And the loading extreme value register is used for storing the gray scale maximum value of the corresponding row in the single-channel video data as the maximum loading voltage count value N of the corresponding row and feeding back the maximum loading voltage count value N to the RAMP DAC logic control unit, and the RAMP DAC logic control unit controls the maximum loading voltage of the corresponding row output by the RAMP DAC according to the maximum loading voltage count value N.
For example, when inputting a frame/field of single-channel Video data, the Video data is Column, and the data bit width is Video _ B bit, wherein the gray scale value range of Row-th line of Video data is [ Mono1, Mono2], and the gray scale value range of Row + 1-th line of Video data is [ Mono3, Mono4], the step of the source driver performing Row-th and Row + 1-th line display includes:
the shift register generates a pulse with a width of VCLK at the lowest bit of the shift register according to the video data valid signal DE, and sequentially transfers the pulse to the high bit of the shift register, wherein VCLK is a pixel clock of source driving, and the bit width of the shift register is the same as Column number Column of the pixel array.
The loading register sequentially stores the single-channel Video data into the loading register according to the pulse effective position in the shift register, wherein the bit width of the loading register is Video _ B, and the number of the loading register is the same as the Column number Column of the pixel array.
The first data of Row in the single-channel Video data is stored into a data comparison register according to the least significant pulse of the shift register, for example, as the first data, and then the 2 nd and 3 … th Column Video data are sequentially compared with the first data, wherein Column is the Column number of Row Video data, the bit width of the data comparison register is Video _ B, if the bit width is greater than the value in the data comparison register, the original value is overwritten, otherwise, the bit width is maintained unchanged, and finally, the maximum gray level value Mono2 is obtained.
When the Row line video data are completely stored in the loading register and the comparison of the video data comparison register is completed, the Row line data loaded in the loading register are simultaneously imported into the display register at the interval when the Row line video data are invalid, and simultaneously Mono2 in the video data comparison register is imported into the loading extremum register and the data comparison register is cleared. And then, when the DE signal of the Row +1 is valid, repeating the operation, wherein the bit width of the display register is Video _ B, the number of the display register is the same as the Column number Column of the pixel array, and the bit width of the loading extremum register is Video _ B.
Mono2 stored in the loading extremum register is used as the maximum loading voltage count value N of the corresponding row and is fed back to the RAMP DAC logic control unit, so as to control the maximum loading voltage output by the RAMP DAC, the video data in the display register is compared with the loading voltage count value cnt at the same time, and the termination time of loading the RAMP voltage VDAC by the pixel unit is controlled, so that the basic pixel unit gray scale display is performed. Referring to fig. 4 and 5, there are diagrams illustrating the relationship between the output voltage value and the loading voltage count value of Row and Row +1 of a monochrome display device using the display driving method in which the maximum loading voltage of the RAMP DAC is dynamically variable.
(2) Inputting multi-channel (specifically R, G, B three-channel) video data for color display
Referring to fig. 6 and 10, the color display driving system of the present invention uses a RAMP DAC with dynamically variable maximum loading voltage to realize display driving, wherein R, G, B channel data comparison registers form the obtaining unit 11, a loading extremum register forms the setting unit 12, and a RAMP DAC logic control unit includes a logic control unit 13.
The display driving device 1 comprises R, G, B channel data comparison registers, a loading extreme value register and a RAMP DAC logic control unit, wherein the R, G, B channel data comparison registers are used for respectively comparing R, G, B channel video data in a row to obtain the maximum gray scale values of R, G, B channels of the row correspondingly, the loading extreme value register is used for storing the maximum value in the maximum gray scale values as the maximum loading voltage count value N of the corresponding row and feeding the maximum loading voltage count value N back to the RAMP DAC logic control unit so as to control the maximum loading voltage output by the RAMP DAC.
When Video data of three channels of one frame/field R, G, B is input, the Video data is Column of Color, the data bit width is Video _ B bit, wherein the gray scale value ranges of the R, G, B channels of the Row-wise Video data are [ Color _ R1, Color _ R2], [ Color _ G1, Color _ G2], [ Color _ B1, Color _ B2], the gray scale value ranges of the R, G, B channels of the Row + 1-wise Video data are [ Color _ R3, Color _ R4], [ Color _ G3, Color _ G4], [ Color _ B3, Color _ B4], and the maximum values of Color _ R2, Color _ G2, Color _ B2 are Color2, Color _ R4, Color _ G4, Color _ B4 are Row and the Row of Color _ B4, the Row driving step includes:
the shift register generates a pulse with a width of VCLK at the lowest bit of the shift register according to the Video data valid signal DE, and sequentially transfers the pulse to the high bit of the shift register, wherein VCLK is a pixel clock of source driving, and the bit width Video _ B of the shift register is the same as the Column number Column of the pixel array.
The R, G, B channel load register sequentially stores R, G, B channels of Video data into the R, G, B channel load register according to the pulse valid bit in the shift register, wherein the bit width of the R, G, B channel load register is Video _ B, and the number of the bit width is the same as the Column number Column of the pixel array.
The first R, G, B channel data of Row in the three-channel Video data are stored in a R, G, B channel data comparison register according to the least significant pulse of a shift register, then 2 nd and 3 … Column R, G, B channel Video data are sequentially compared with the channel data, the bit width of the R, G, B channel data comparison register is Video _ B, if the bit width is larger than the value in the R, G, B channel data comparison register, the original value is covered, otherwise, the bit width is kept unchanged, and finally, the maximum gray-scale values Color _ R2, Color _ G2 and Color _ B2 are obtained respectively. R, G, B the specific method for acquiring the maximum gray scale value in the video data of the corresponding channel in a row is shown in the above "(1) inputting single-channel video data for monochrome display" for the specific method for acquiring the maximum gray scale value in the 1 st row.
When the video data of the Row Row of the R, G, B channel is completely stored in the channel R, G, B loading register, and simultaneously the comparison of the R, G, B channel data comparison register is completed, in the gap that the video data of the Row Row is invalid, the Row Row data in the channel R, G, B loading register is simultaneously imported into the channel R, G, B display register, and simultaneously the maximum Color2 (namely, the Color2 is the maximum value of the gray scale of the Row Row) of the Color _ R2, the Color _ G2 and the Color _ B2 in the channel R, G, B data comparison register is imported into the loading extremum register, and the channel R, G, B data comparison register is cleared. Then, when the Row +1 DE signal is active, the above operations are repeated, wherein the R, G, B channel indicates that the bit width of the register is Video _ B, the number of the registers is the same as the Column number Column of the pixel array, and the loaded extremum register bit width is Video _ B.
The Color2 stored in the loading extremum register is used as the maximum loading voltage count value N of the corresponding row and is fed back to the RAMP DAC logic control unit, so as to control the maximum loading voltage output by the RAMP DAC, the video data in the R, G, B channel display register is compared with the loading voltage count value cnt at the same time, and the termination time of loading the RAMP voltage VDAC by the pixel unit is controlled, so that the gray scale display of the basic pixel unit is performed. Referring to fig. 7 and 8, there are diagrams illustrating the relationship between the output voltage value and the loading voltage count value of Row and Row +1 of a color display device using the display driving method in which the maximum loading voltage of the RAMP DAC is dynamically variable.
For the case of multiple channels, the maximum gray scale values Color _ R2, Color _ G2, and Color _ B2 of the corresponding channel in Row-th Row may not be obtained as described above, and then the maximum value Color2 is compared as the maximum gray scale value of the Row-th Row, for example, any data in the video data of all the channels in a Row, such as Row 2, may be selected as the first data of the Row, such as Row 2, the selected first data is set as the current candidate gray scale maximum value of the Row, such as Row 2, the video data of the multiple channels in Row 2 includes multiple data, the comparator compares the current candidate gray scale maximum value of the Row, such as Row 2, with other data in the video data in the Row, such as Row 2, except the first data of the Row, such as Row 2, if the other data in the Row, such as Row 2, are all smaller than or equal to the current candidate gray scale maximum value of the Row, the current candidate gray level maximum for that row, row 2, is the gray level maximum for that row, row 2. And if the second data of the other data in the 2 nd row obtained by comparison is larger than the current candidate gray scale maximum value in the 2 nd row, taking the second data in the 2 nd row as the candidate gray scale maximum value in the next comparison in the 2 nd row. Comparisons of other rows and so on.
The RAMP voltage output by the RAMP DAC is linearly related to the load voltage count value cnt.
Under the condition that the step value of the output loading voltage of the RAMP DAC is not changed, the smaller the maximum loading voltage counting value N is, the smaller the output maximum loading voltage of the RAMP DAC is.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the units is only one type of logical function division, and other division manners may be available in actual implementation, for example, a plurality of units or components may be combined or integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network elements. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium/unit includes: various media capable of storing program codes, such as a Universal Serial Bus flash disk (usb flash disk), a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, and an optical disk.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. A display driving method, comprising the steps of:
acquiring a gray scale maximum value in the video data of at least one line;
setting the maximum gray scale value as the maximum loading voltage count value N of the corresponding row;
and controlling the DAC to output the maximum loading voltage of the corresponding row based on the maximum loading voltage count value N.
2. The display driving method according to claim 1, wherein the method for obtaining the maximum gray level is:
when behaving as a single channel:
setting first data in video data of a line as the maximum value of the current candidate gray scale of the line, wherein the video data of the line comprises a plurality of data, and the single-channel video data of the line is the video data of the line;
comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of the row through a comparator;
if the other data in the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row;
when the behavior is multi-channel:
respectively setting first data in the video data of each channel in a row as the current candidate gray scale maximum value of the corresponding channel in the row, wherein the video data of each channel comprises a plurality of data;
comparing the current candidate gray scale maximum value of the channel corresponding to the row with other data except the first data of the channel corresponding to the row in the video data of the channel corresponding to the row by a comparator;
if the other data of the corresponding channel of the row are all smaller than or equal to the current candidate gray scale maximum value of the corresponding channel of the row, the maximum value of the current candidate gray scale maximum values of the corresponding channel of the row is the gray scale maximum value of the row;
or selecting any data from the video data of all channels in a row as the first data of the row, and setting the selected first data as the current candidate gray scale maximum value of the row, wherein the video data of all channels comprises a plurality of data; comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of all the channels of the row by a comparator; and if the other data of the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row.
3. The method according to claim 2, wherein if a second data of the other data of the one row or the corresponding channel of the one row is larger than the current candidate gray-scale maximum value of the one row or the corresponding channel of the one row, the second data of the one row or the corresponding channel of the one row is used as a candidate gray-scale maximum value for a next comparison of the one row or the corresponding channel of the one row.
4. The display driving method according to claim 2, wherein the other data of the one row or channel is subsequent data of the first data of the one row or channel.
5. A display driving apparatus, comprising:
an acquisition unit configured to acquire a maximum value of gray scale in video data of at least one line;
the setting unit is used for setting the maximum gray scale value as the maximum loading voltage count value N of the corresponding row;
a logic control unit for controlling the DAC to output the maximum load voltage of the corresponding row based on the maximum load voltage count value N.
6. The display driving apparatus according to claim 5, wherein the obtaining unit is configured to obtain the maximum grayscale value by:
when behaving as a single channel:
setting first data in video data of a line as the maximum value of the current candidate gray scale of the line, wherein the video data of the line comprises a plurality of data, and the single-channel video data of the line is the video data of the line;
comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of the row through a comparator;
if the other data in the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row;
when the behavior is multi-channel:
respectively setting first data in the video data of each channel in a row as the current candidate gray scale maximum value of the corresponding channel in the row, wherein the video data of each channel comprises a plurality of data;
comparing the current candidate gray scale maximum value of the channel corresponding to the row with other data except the first data of the channel corresponding to the row in the video data of the channel corresponding to the row by a comparator;
if the other data of the corresponding channel of the row are all smaller than or equal to the current candidate gray scale maximum value of the corresponding channel of the row, the maximum value of the current candidate gray scale maximum values of the corresponding channel of the row is the gray scale maximum value of the row;
or selecting any data from the video data of all channels in a row as the first data of the row, and setting the selected first data as the current candidate gray scale maximum value of the row, wherein the video data of all channels comprises a plurality of data; comparing the current candidate gray-scale maximum value of the row with other data except the first data of the row in the video data of all the channels of the row by a comparator; and if the other data of the row are all smaller than or equal to the current candidate gray scale maximum value of the row, the current candidate gray scale maximum value of the row is the gray scale maximum value of the row.
7. The device of claim 6, wherein if a second data of the other data of the one row or the corresponding channel of the one row is greater than the current candidate gray-scale maximum value of the one row or the corresponding channel of the one row, the second data of the one row or the corresponding channel of the one row is used as a candidate gray-scale maximum value for a next comparison of the one row or the corresponding channel of the one row.
8. The display driving device according to claim 6, wherein the other data of the one row or channel is subsequent data of the first data of the one row or channel.
9. The display driving device according to any one of claims 5 to 8, wherein the loading voltage count value cnt outputted by the logic control unit is stepped up to the maximum loading voltage count value N according to the DAC internal clock CLK, and the cnt satisfies the relation: n is not less than cnt and not more than 2Video_B-1, where Video _ B is the bit width of the input Video data.
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