CN1210415A - Treatment of pseudo image element of LED color screen - Google Patents

Abstract

A pesudo-pixel processing method for colour screen of LEDs features that in an image frame the LEDs in a colour screen are recombined and redisplayed several times to increase the number of psudo pixels by 4 times without basic change of hardware, resulting in higher image a resolution. A scheme for processing the pseudo pixels of two-primary-colour LED screen, a scheme for processing the pseudo pixels of three-primary-colour LED screen, the arrangement and combination mode of LEDs for each scheme and an equation to calculate the brightness of LED are disclosed.

Description

Treatment of pseudo image element of LED color screen

The present invention proposes a kind of with the LED in the LED colorful display screen repeatedly combination and the repeatedly image processing method of demonstration in a two field picture.Basically do not increase under the hardware devices circumstances, can increase by four times of pixel numbers, improve image resolution ratio.

Each pixel is formed by several fixing LED in the general LED colorful display screen.Every LED only makes up once in a two field picture, only shows once.

The dummy pixel treatment technology of now setting forth two primary colours and three-primary color LED colorful display screen respectively is as follows:

Two primary-color LED colorful display screens

A kind of high brightness two primary colours outdoor LED color electrics screen LED permutation and combination method is shown in figure one.Its each pixel is made up of two redness and two green LED.If this electrical screen is made up of M row and the capable LED of N, then the pixel of this electrical screen adds up to $\frac{\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="A9810276100061.png,A9810276100062.png"\; state="\{\{state\}\}">M</figure-callout>}}{2}\&times;\frac{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="A9810276100061.png,A9810276100062.png"\; state="\{\{state\}\}">N</figure-callout>}}{2}=\frac{1}{4}\mathrm{MN}$ 。Because process technology limit, the LED volume is bigger, general pixel can only reach 4000 points/square metre about.

The present invention proposes a kind of display packing with four combinations of every LED in a two field picture, then with pixel point by point scanning, increase by 4 times image thereby obtain pixel, resolution improves greatly.1, dummy pixel scanning theory

If I _KLBe the K row, the LED that L is capable, the order of the first row pixel is by (I during conventional sweep _1,1I _2,1I _1,2I ₂₂), (I ₃₁I ₄₁I ₃₂I ₄₂) ... LED forms shown in the solid line square.Every LED only uses once.The order of the first row pixel is (I during dummy pixel scanning ₁₁I ₂₁I ₁₂I ₂₂), (I ₂₁I ₃₁I ₂₂I ₃₂) (I ₃₁I ₄₁I ₃₂I ₄₂) (I ₄₁I ₅₁I ₄₂I ₅₂) ... except that forming pixel, the LED of square shown in the solid line also comprises the pixel of adjacent two 4 LED compositions, shown in dotted line.Every LED uses secondary in every row, and the columns of pixel has increased by one times like this.

In like manner, line number also doubles, and has more delegation between two row.The number of total like this pixel is that M * N equates with the LED number, has improved 4 times than original.2, the specific implementation of dummy pixel scanning theory

The dummy pixel scanning theory can have following two kinds of methods to realize.(1) hardware approach

Adopt hardware approach, make LED adopt circuit control respectively, repeatedly to make up LED point by point scanning and show according to the requirement of " dummy pixel scanning theory ".It is complicated to do circuit like this, and cost is higher, and is inadvisable.(2) software approach

The dummy pixel scanning theory also method of available software is realized that hardware is constant substantially.Each LED is luminous 4 times when analyzing " dummy pixel scanning theory " and finding every scanning one two field picture; Make up 4 times, and the corresponding red and green data of M * N pixel are used respectively twice.

Can be from above analysis in the hope of every LED4 luminous mean value every two field picture, quite dummy pixel scans the excessive effects of four light emitting pixels. $I_{\mathrm{KL}}\&prime;=\frac{I_{(K-1)(L-1)}+I_{K(L-1)}+I_{(K-1)L}+I_{\mathrm{KL}}}{4}$ I _KL': represent K row, the LED brightness value that L is capable, R _KL': (red LED) and G _KL＇ (green LED) arranges and value by following rule: a) I when K and L are odd number or are even number _KL' :=R _KL' be red, all get red data at corresponding 4.B) as one of them I when another is even number for odd number of K and L _KL'=G _KL' be green, all get green data at corresponding 4.

The data matrix that obtains a M * N at last is corresponding one by one with M * N LED respectively.The corresponding red data of red LED; The corresponding green data of green LED.Just can on electrical screen, show a two field picture by prior art, meet the requirement of " dummy pixel scanning theory " equally.Pixel increases by 4 times, and image resolution ratio improves greatly.

Owing to used K_1 in calculating; So the data data dot matrix of L_1 should than the LED dot matrix many delegation and one row.

Conclude above the analysis, this technology can be described as follows: the display screen that two primary colours (red and green) are rearranged by figure one rule by M * N LED is 4 LED (two red, two green) composition one pixels under the normal condition, be total to Individual pixel.Adopt the dummy pixel treatment technology, the data dot matrix (every bit comprises red and green two data) of original (M+1) * (N+1) [many delegation and a columns according to] can be obtained M * N data dot matrix corresponding with LED one by one (being red or green) after as calculated, be presented on the screen according to prior art then.

The three-primary color LED colorful display screen

A kind of high brightness three primary colors outdoor LED colorful display screen is shown in figure two.Its structure is similar fully to two primary colours, just adds the LED of a blueness at the center of each pseudomorphism vegetarian refreshments.Each two field picture Smalt LED only makes up once, shows once.

Conclude to get up to be described below: M * N the display screen that red and green LED rearranges by two primary colours rules, when changing over the three primary colors display screen, need add a blue led in each dummy pixel dot center, need altogether (M-1) * (N-1) blue led, altogether (M-1) * (N-1) individual three primary colors color artifacts vegetarian refreshments.Red and green LED brightness calculation method is the same with two primary colours display screens; Blue led is then directly got corresponding dummy pixel point blue led data.Then data are presented on the screen according to prior art with LED is corresponding one by one.

Claims (3)

1, the present invention proposes the dummy pixel scanning technique: a kind of with the LED in the LED colorful display screen repeatedly combination and the repeatedly image processing method of demonstration in a two field picture.Basically the columns and the line number that do not change pixel in the hardware devices circumstances next frame image all double, and the pixel number increases by four times, improve image resolution ratio.

2, propose two concrete primary-color LED colorful display screens and realized the scheme that dummy pixel is handled.The computing formula that designs LED arrangement mode and compound mode and derive every LED four luminous mean flow rates in a two field picture $I_{\mathrm{KL}}\&prime;=\frac{I_{(K-1)(L-1)}+I_{K(L-1)}+I_{(K-1)L}+I_{\mathrm{KL}}}{4}$ I _KL': represent the average brightness value of the LED that K is listed as, L is capable, R _KL' and G _KL': arrange (as figure one) and value by following rule: a) I when K and L are odd number or are even number _KL'=R _KL': be redness, all get red data at corresponding 4.B) as one of them I when another is even number for odd number of K and L _KL'=G _KL' be green, all get green data at corresponding 4.

3, propose a concrete three-primary color LED colorful display screen and realize the scheme that dummy pixel is handled.Design LED arrangement mode and compound mode: R _KLAnd G _KLIn full accord with two primary colours display screens, just increase a blue L at each dummy pixel dot center place _EDBe B _KL(as figure two) points out that red, green LED brightness value computing formula is identical with two primary colours schemes; And the blue led brightness value is got the corresponding dummy pixel chromatic number certificate of filling enamel.

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