CN107507559B - A method of promoting LED high color depth display effect - Google Patents
A method of promoting LED high color depth display effect Download PDFInfo
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- CN107507559B CN107507559B CN201710536814.0A CN201710536814A CN107507559B CN 107507559 B CN107507559 B CN 107507559B CN 201710536814 A CN201710536814 A CN 201710536814A CN 107507559 B CN107507559 B CN 107507559B
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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]
Abstract
The present invention provides a kind of methods for promoting LED high color depth display effect, adjust the unit pulse width of LED display, △ t according to the following formulam= (m‑n)△tn, wherein △ tmFor the unit pulse width for the LED display that perception display effect is m tonal gradations, △ tnFor the unit pulse width of the LED display of n tonal gradations, n is the tonal gradation of image before adjusting, and m is the tonal gradation of image perception after adjusting.Above method is by the unit pulse width of change LED display, and the color depth of LED display is deeper, and gray-level is more, and display picture is finer and smoother, and color is richer, reaches the display effect of higher color depth rank.
Description
Technical field
The present invention relates to LED display display effect control technology fields more particularly to a kind of promotion LED high color depth to show
The method of effect.
Background technique
LED display has the advantages that brightness is high, the service life is long, operation and maintenance is easy as large size display equipment, and
Display effect very rich can be shown, station, harbour, outdoor advertising, large-scale cultural and sports activity, government notice are widely used in
Equal places.It is various for influencing the factor of LED display effect, wherein critically important one side is revealable tonal gradation i.e. face
The ability of color depth, usual color depth is deeper, and the color for drawing display is abundanter, and color is more gorgeous, and picture is also finer and smoother, is easier to
Show details abundant.Domestic LED control system tonal gradation is all to become 8 bit primary colors after gamma is adjusted at present
It changes, the tonal gradation after extending is 10 bits, 12 bits, 14 bits, and maximum can accomplish 16 bits ash
Grade is spent, namely there are 65536 (216) to plant brightness change to entirely white from completely black, although current 16 bit gray scale substantially meets one
As demand, but with the development in market, especially small spacing is grown rapidly to color requirements, and in the lower situation of brightness
The requirement of gray scale display effect is also constantly promoted, and existing color depth is also less full to the lower occasion gray scale display effect of certain brightness
Meaning, needs the display control program of higher color depth to promote display effect.
LED display control program color depth on domestic market only up to reach 16 bit gray scales, general occasion
Substantially can meet the requirements, but it is certain require the lower occasion of brightness under, low gray portion sometimes will appear disconnected ash
Phenomenon, picture is excessively uneven, has visually seemed gray scale Loss.
Summary of the invention
In order to solve the above problem, the present invention provides visually seem be not in gray scale Loss a kind of promotion
The method of LED high color depth display effect.
Technical solution of the present invention specifically:
A method of LED high color depth display effect being promoted, the unit pulse for adjusting LED display according to formula one is wide
Degree,
Wherein, △ tmFor the unit pulse width for the LED display that perception display effect is m tonal gradations, △ tnFor n
The unit pulse width of the LED display of position tonal gradation, n are the tonal gradation of image before adjusting, and m is image perception after adjusting
Tonal gradation.
Preferably, the method includes photoelectric characteristic transformation, comprising:
Obtain LED display display image signals；
Obtain the brightness value matrix that each pixel in image includes R, G, B component value；
Each pixel that image after adjusting is obtained according to formula two includes the brightness value matrix of R, G, B component value:
In formula, m is the tonal gradation of image perception after adjusting, and n is image grayscale grade before adjusting, and Q is image before adjusting
Gradation data, P is the gradation data of image after adjusting, and K is transformation factor, and λ is transformation coefficient, 0.8≤λ≤2.8, wherein ash
Degree is according to including R component value, G component value and B component value.
Preferably, after photoelectric characteristic transformation, the method also includes visual characteristic transformation, comprising:
Obtain the brightness value of each display data bits of image before adjusting；
The brightness value of image individual data bit is adjusted according to formula three,
A in formulal1To alnIt is correction coefficient, XnFor the brightness value for adjusting preceding image n data bits, YlImage after adjusting
The brightness value of l data bits, l are the natural number less than m.
A kind of method promoting LED high color depth display effect proposed by the present invention, by the unit arteries and veins for adjusting LED display
Width is rushed, the other display effect of higher tonal gradation is reached, color depth is deeper, and gray-level is more, and display picture is finer and smoother, color
Richer, within the identical display period, it is more careful than original that tonal gradation is divided, and picture is shown more evenly, can be very good
Solve situation gray scale overscale problems not high in brightness, the display effect of LED display be improved significantly.
Specific embodiment
Further to illustrate technological means and its effect adopted by the present invention, below in conjunction with preferred implementation of the invention
Example is described in detail.
It is to realize gray scale display technology by pulse that LED, which is shown, and due to the characteristic of human eye, optical signal is passed to cerebral nerve
It afterwards, is to disappear immediately within one very of short duration time, i.e., light makees vision caused by retina in light stopping to it
With rear, still retain a period of time, since this characteristic of human eye exists, so the brightness of light emitting diode can pass through control point
The length and frequency of the time of brighten the hair optical diode realizes this grey scale change, color depth, that is, gray scale bit of display system
Depth is deeper, and tonal gradation just divides thinner, and image is shown just finer and smoother.
Such as LED display will show 65536 grades of gray scales, the pulse width of display can be divided into 65536 equal parts,
Unit pulse width is Δ t, corresponding 1 tonal gradation of each pulse width, when tonal gradation is 0 (being encoded to 16 ' h0)
When, LED display brightness is in minimum state, when tonal gradation is 65536 grades (being encoded to 16 ' hffff '), LED display
Brightness highest.When display control program use 16 bit color depth when, display system has 65536 tonal gradations, from it is most black to
It is most bright to be divided into 65536 levels.
The present invention provides a kind of methods for promoting LED high color depth display effect, adjust LED display according to formula one
Unit pulse width,
Wherein, △ tmFor the unit pulse width for the LED display that perception display effect is m tonal gradations, △ tnFor n
The unit pulse width of the LED display of position tonal gradation, n are the tonal gradation of image before adjusting, and m is image perception after adjusting
Tonal gradation.By adjusting the unit pulse width of LED display, reach the other display effect of higher tonal gradation, color depth
Deeper, gray-level is more, and display picture is finer and smoother, and color is richer, and within the identical display period, tonal gradation divides ratio
Original more careful, picture, which is shown, more evenly can be very good to solve the situation gray scale overscale problems not high in brightness, and LED is shown
The display effect of screen be improved significantly.
It is generally 8 bit gradation datas, the original of 8 bits from the original gradation data that LED display control program inputs
The photoelectric characteristic of beginning gradation data and nonideal linear characteristic, it is therefore desirable to carry out photoelectric characteristic transformation.
Specifically: obtain LED display display image signals；
Obtain the brightness value matrix that each pixel in image includes R, G, B component value；
Each pixel that image after adjusting is obtained according to formula two includes the brightness value matrix of R, G, B component value:
In formula, m is the tonal gradation of image perception after adjusting, and n is image grayscale grade before adjusting, and Q is image before adjusting
Gradation data, P be adjust after image gradation data, K is transformation factor, need to obtain in multiple correction course, λ be transformation
Coefficient, 0.8≤λ≤2.8, gradation data include R component value, G component value and B component value.
Image effect may be significantly improvement after being converted according to above-mentioned formula two, and image is excessively naturally, picture quality has
It is promoted.
Due to perception of the human eye to brightness be it is nonlinear, such as the current control of 256 tonal gradation LED display systems is pressed
After 256 equal parts, 256 grades etc. can be formed and divide brightness, but human eye can obviously feel brightness change in the low-light level stage, but
It is but to feel unobvious in the high brightness stage, therefore when LED display is in the high brightness stage, convert it in photoelectric characteristic
Afterwards, need to carry out a visual characteristic nonlinear transformation processing, visual characteristic transformation specifically includes the following steps:
Obtain the brightness value of each display data bits of image before adjusting；
The brightness value of image individual data bit is adjusted according to formula three,
A in formulal1To alnIt is correction coefficient, XnFor the brightness value for adjusting preceding image n data bits, YlImage after adjusting
The brightness value of l data bits, l are the natural number less than m.
More specifically, the image grayscale grade before adjusting is n, there is 0 to n-1 display data bits in image, obtain
Take the brightness value of 0 to n-1 each data bits, respectively X1..., Xn, in the case where being highlighted, adjusting unit arteries and veins
After rushing time width, image perception tonal gradation is m, and the image after adjusting includes 0 to m-1 m display data bits,
Wherein:
First display data bits brightness be
Second display data bits brightness value be
L shows that the brightness value of data bits is ... ...
M shows that the brightness value of data bits is
Wherein a01To a(m-1)N is corrected parameter, and needs repeatedly amendment that could obtain with ideal display effect.
A kind of method promoting LED high color depth display effect proposed by the present invention, by the unit arteries and veins for adjusting LED display
Width is rushed, the other display effect of higher tonal gradation is reached, color depth is deeper, and gray-level is more, and display picture is finer and smoother, color
Richer, within the identical display period, it is more careful than original that tonal gradation is divided, and picture is shown more evenly, can be very good
Solve situation gray scale overscale problems not high in brightness, the display effect of LED display be improved significantly.
The above for those of ordinary skill in the art can according to the technique and scheme of the present invention and technology
Other various corresponding changes and modifications are made in design, and all these change and modification all should belong to the claims in the present invention
Protection scope.
Claims (1)
1. a kind of method for promoting LED high color depth display effect characterized by comprising
The unit pulse width of LED display is adjusted according to formula one,
Wherein, △ tmFor the unit pulse width for the LED display that perception display effect is m tonal gradations, △ tnFor n ashes
The unit pulse width of the LED display of grade is spent, n is the tonal gradation of image before adjusting, and m is the ash of image perception after adjusting
Spend grade；
Photoelectric characteristic convert and then carry out visual characteristic transformation, wherein photoelectric characteristic transformation the following steps are included:
Obtain LED display display image signals；
Obtain the brightness value matrix that each pixel in image includes R, G, B component value；
Each pixel that image after adjusting is obtained according to formula two includes the brightness value matrix of R, G, B component value:
In formula, m is the tonal gradation of image perception after adjusting, and n is image grayscale grade before adjusting, and Q is the ash of image before adjusting
Degree evidence, P are the gradation datas of image after adjusting, and K is transformation factor, and λ is transformation coefficient, 0.8≤λ≤2.8, wherein grey
According to including R component value, G component value and B component value；
Visual characteristic transformation the following steps are included:
Obtain the brightness value of each display data bits of image before adjusting；
The brightness value of each data bits of image is adjusted according to formula three,
A in formulal1To alnIt is correction coefficient, XnFor the brightness value for adjusting preceding image n data bits, YlImage l number after adjusting
According to the brightness value of bit, l is the natural number less than m.
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| CN113096586B (en) * | 2019-12-20 | 2022-08-02 | 深圳蓝普科技有限公司 | Display screen, gray level modulation method thereof, display device and storage medium |
| CN112669768B (en) * | 2020-12-29 | 2022-06-10 | 深圳Tcl数字技术有限公司 | LED display screen brightness adjusting method, device and equipment and readable storage medium |
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| CN102332247A (en) * | 2011-11-25 | 2012-01-25 | 深圳市摩西尔电子有限公司 | Method for adjusting LED (Light Emitting Diode) gray scale |
| CN203386459U (en) * | 2013-06-27 | 2014-01-08 | 深圳市明微电子股份有限公司 | Display control system supporting grayscale extension and driving chip |
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| CN1773788A (en) * | 2004-11-08 | 2006-05-17 | 精工爱普生株式会社 | Light source controller, light source controlling method and image display device |
| CN101360378A (en) * | 2008-09-05 | 2009-02-04 | 广州市雅江光电设备有限公司 | Light regulating method for LED light regulating apparatus |
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