CN104394408A - Laser television colour gamut coverage rate measuring method - Google Patents
Laser television colour gamut coverage rate measuring method Download PDFInfo
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- CN104394408A CN104394408A CN201110461664.4A CN201110461664A CN104394408A CN 104394408 A CN104394408 A CN 104394408A CN 201110461664 A CN201110461664 A CN 201110461664A CN 104394408 A CN104394408 A CN 104394408A
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Abstract
The invention discloses a laser television colour gamut coverage rate measuring method. The method is characterized in that the method comprises the following steps: to begin with, after a detected laser television is adjusted according to rules, inputting full red field, full green field and full blue field signals to the laser television respectively; measuring with a colorimeter chromaticity coordinates (u'r, v'r), (u' g, v'g) and (u'b, v'b) of the center point of a screen in sequence; and then calculating the area Srgb of R, G, B triangle by utilizing a formula, wherein the Srgb = 1/2 [(u'r -u'b) (v'g - v'b) - (u'g -u'b)( v'r- v'b)]; expressing the color gamut coverage rate with Cp, wherein the Cp = Srgb/0.1952 * 100%, u' = 4 x /3-2x+12y and v'= 9 y/3-2x+12y; and then, calculating the Srgb and Cp according to the formulas above. Through a relational model, electrical signals transmitted from the television are converted into electrical signals of laser accordingly, thereby realizing correct color reappearance. The method solves the problem that the color television signal three primary colors and laser three primary colors are different in chroma points, the reappeared color gamuts are different, and an existing display mode only supports color conversion in an existing display system and does not support color conversion of laser display.
Description
Technical field
The present invention relates to laser television field, be specifically related to a kind of method of measurement of laser television color domain coverage ratio.
Background technology
Since nineteen sixty, first laser came out, Development of Laser Technology is at full speed, and be widely used, laser display is exactly the new development of laser technology in display field, new opplication.Laser television has the following advantages compared with traditional tv: brightness is high, resolution is high, colour is distinct.Laser television is also the effective means obtaining large-screen colour TV image.In recent years, the development due to the correlation technique such as microelectric technique and processing makes three primary light source solidification, and efficiency also improves greatly.The market demand of information and multimedia display also have stimulated the fast development of laser television.In recent years, all solid state laser technology achieves the development of advancing by leaps and bounds, in succession develop that volume is little, more than power Gao Dewa level red, green, blue DPL (diode pump laser) all solid state laser, this is just for the display of development laser video is laid a good foundation.
In laser display, because laser three primary colors are different from the chroma point of traditional fluorescent material three primary colors, the region of color reproduction is different, when same vision signal controls, misalignment and confusion can be produced, therefore in laser display, fluorescent material three primary colors must be carried out Color Gamut Mapping to laser three primary colors, the laser display of reception fluorescent material tristimulus signals just can be made to obtain correct color reproduction.
Summary of the invention
The object of the invention is to overcome colour TV signal three primary colors different from the chroma point of laser three primary colors, the color gamut of reproduction is different, existing display output only supports the color conversion in the middle of existing display system, do not support the problem of the color conversion of laser display, a kind of method of measurement of color conversion system of applicable laser television display is provided.
For achieving the above object, the present invention is by the following technical solutions: a kind of method of measurement of laser television color domain coverage ratio, is characterized in that operating according to following step:
First after tested laser television is adjusted by regulation, full Red Square, full Lv Chang and complete blue field signal are input to laser television respectively, with colorimeter measure successively screen center's point chromaticity coordinate (u ' r, v ' r), (u ' g, v ' g) and (u ' b, v ' b), then formula is utilized to carry out calculating R, the leg-of-mutton area Srgb of G, B
Srgb＝1/2[(u’r-u’b)(v’g-v’b)-(u’g-u’b)(v’r-v’b)]
Color domain coverage ratio Cp represents, its value is that the area (the leg-of-mutton area of R, G, B) of tested machine colour gamut divided by 0.1952, is multiplied by 100%, i.e. Cp=Srgb/0.1952 × 100%,
If that measure is CIE1931 (x, y) value, instead of CIE1976 (u ', v ') value, so should first formula be below used to convert the value of (u ', v ') coordinate system to by measuring each (x, y) value of obtaining, u '=4x/3-2x+12y v '=9y/3-2x+12y, and then by above-mentioned formulae discovery Srgb and Cp; By relational model as shown in Figure 3, will correspondingly convert the signal of telecommunication of laser on TV to from the signal of telecommunication transmitted, thus realize the correct reproduction of color.
Adopt the beneficial effect of technique scheme:
Laser display selects three look laser as three primary colors, colour triangle is approximately 2.3 times of traditional C RT display, cause the deviation of laser display colour gamut and existing TV color coordinates system simultaneously, as CRT three primary colors and the proportionate relationship of laser three primary colors time Fig. 1,2 is illustrated respectively in coupling equal-energy white, the difference of two proportionate relationships obviously can be found out.This situation shows set up new color coordinates to laser display, and in order to adapt to the requirement of existing television system, should set up existing CRT and showing the color map relation corresponding with laser display.For CRT color coordinates system and laser display color coordinates system, it is all the color coordinate system with device-dependent.Here go CIE1931 standard color coordinates system as middle transition, the relation of CRT color coordinate system, laser display color coordinate system and CIE1931 standard color coordinates system is set up respectively with multiple regression procedure, through linear transformation, obtain relational expression as shown in Figure 3.By the relational model of Fig. 3, laser display colour switching matrix application can be set up in laser display with electronic device, by the chromaticity coordinate of colorimeter successively test screen central point, substitute into color domain coverage ratio formulae discovery and go out numerical value.Overcome colour TV signal three primary colors different from the chroma point of laser three primary colors, the color gamut of reproduction is different, and existing display output only supports the color conversion in the middle of existing display system, does not support the problem of the color conversion of laser display.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail.
Accompanying drawing 1 is the proportionate relationship schematic diagrames of CRT three primary colors when mating equal-energy white.
Accompanying drawing 2 is that laser is as proportionate relationship schematic diagram during three primary colors coupling equal-energy white.
Accompanying drawing 3 is relation schematic diagrames of laser display color coordinate system and CIE1931 standard color coordinates system.
Embodiment
In this method of measurement, after tested laser television is adjusted by regulation, full Red Square, full Lv Chang and complete blue field signal are input to laser television respectively, with colorimeter measure successively screen center's point chromaticity coordinate (u ' r, v ' r), (u ' g, v ' g) and (u ' b, v ' b), then formula is utilized to carry out calculating R, the leg-of-mutton area Srgb of G, B.
Srgb＝1/2[(u’r-u’b)(v’g-v’b)-(u’g-u’b)(v’r-v’b)]
Color domain coverage ratio Cp represents, its value is that the area (the leg-of-mutton area of R, G, B) of tested machine colour gamut, divided by 0.1952, is multiplied by 100%, namely
Cp＝Srgb/0.1952×100％
If what measure is CIE1931 (x, y) value, instead of CIE1976 (u ', v ') value, so should first formula be below used to convert the value of (u ', v ') coordinate system to by measuring each (x, y) value of obtaining.
u’＝4x/3-2x+12y
v’＝9y/3-2x+12y
And then by above-mentioned formulae discovery Srgb and Cp.
By the relational model of Fig. 3, will correspondingly convert the signal of telecommunication of laser on TV to from the signal of telecommunication transmitted, thus realize the correct reproduction of color, i.e. color rendition.
Claims (1)
1. a method of measurement for laser television color domain coverage ratio, is characterized in that operating according to following step:
First after tested laser television is adjusted by regulation, full Red Square, full Lv Chang and complete blue field signal are input to laser television respectively, with colorimeter measure successively screen center's point chromaticity coordinate (u ' r, v ' r), (u ' g, v ' g) and (u ' b, v ' b), then formula is utilized to carry out calculating R, the leg-of-mutton area Srgb of G, B
Srgb＝1/2[(u’r-u’b)(v’g-v’b)-(u’g-u’b)(v’r-v’b)]
Color domain coverage ratio Cp represents, its value is that the area (the leg-of-mutton area of R, G, B) of tested machine colour gamut divided by 0.1952, is multiplied by 100%, i.e. Cp=Srgb/0.1952 × 100%,
If that measure is CIE1931 (x, y) value, instead of CIE1976 (u ', v ') value, so should first formula be below used to convert the value of (u ', v ') coordinate system to by measuring each (x, y) value of obtaining, u '=4x/3-2x+12y v '=9y/3-2x+12y, and then by above-mentioned formulae discovery Srgb and Cp; By relational model as shown in Figure 3, will correspondingly convert the signal of telecommunication of laser on TV to from the signal of telecommunication transmitted, thus realize the correct reproduction of color.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110461664.4A CN104394408A (en) | 2011-12-30 | 2011-12-30 | Laser television colour gamut coverage rate measuring method |
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| CN201110461664.4A CN104394408A (en) | 2011-12-30 | 2011-12-30 | Laser television colour gamut coverage rate measuring method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105357521A (en) * | 2015-11-04 | 2016-02-24 | 广东威创视讯科技股份有限公司 | Method for measuring color domain coverage ratio and associated equipment |
| CN106604025A (en) * | 2016-12-15 | 2017-04-26 | 广东威创视讯科技股份有限公司 | Method and apparatus for measuring multi-primary-color gamut coverage |
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2011
- 2011-12-30 CN CN201110461664.4A patent/CN104394408A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105357521A (en) * | 2015-11-04 | 2016-02-24 | 广东威创视讯科技股份有限公司 | Method for measuring color domain coverage ratio and associated equipment |
| CN105357521B (en) * | 2015-11-04 | 2017-07-18 | 广东威创视讯科技股份有限公司 | A kind of method and relevant device for measuring color domain coverage ratio |
| CN106604025A (en) * | 2016-12-15 | 2017-04-26 | 广东威创视讯科技股份有限公司 | Method and apparatus for measuring multi-primary-color gamut coverage |
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Application publication date: 20150304 |