CN109870844A - A kind of energy-saving displaying method based on complementary color light - Google Patents
A kind of energy-saving displaying method based on complementary color light Download PDFInfo
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- CN109870844A CN109870844A CN201910205368.4A CN201910205368A CN109870844A CN 109870844 A CN109870844 A CN 109870844A CN 201910205368 A CN201910205368 A CN 201910205368A CN 109870844 A CN109870844 A CN 109870844A
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Abstract
The present invention discloses a kind of energy-saving displaying method based on complementary color light, comprising steps of judging position of certain coloured light in colour gamut whether in predetermined point, if then being expressed and being shown with Y, R, G, B four primaries by liquid crystal filter array；Conversely, then being expressed and being indicated with RGB three primary colors.The present invention is by first judging position of the coloured light in colour gamut, if it is scheduled point, then just with Y, R, G, B, these four primary colors are expressed and are shown, and if it is not belonging to this scheduled point, then continue to be indicated with RGB three primary colors, maximum energy-saving effect can be reached in this way.
Description
Technical field
The present invention relates to the field of display technology of display, more particularly to a kind of energy saving display side based on complementary color light
Method.
Background technique
In current HDTV broadcast system, International Telecommunication Union ITU-R BT.709-4 recommendation is executed, by mainstream at that time
Display cathode ray tube (CRT) sets colorimetric parameter, and the triangle defined using R, G, B three primary colors can realize colour gamut as system,
That is sRGB colour gamut.In sRGB colour gamut, all colours of triangle covering these three primary colors can all be indicated with R, G, B.It is usually white
Light is used as the back light unit of liquid crystal, and white light generates tri- monochromatic light of RGB after penetrating RGB three-colour filter.People pass through electricity
Voltage-controlled liquid crystal processed achievees the purpose that RGB tri- monochromatic brightness of the control by liquid crystal, generates not after the mixing of the additivity of human brain
Same color perception.
For further expansion colour gamut coverage area, promote the visual experience of the mankind, more and more researchers start by
Attention focuses in the expression and display of more primary colors.For example, possessing the Sharp of " father of liquid crystal " in recent years always in LCD liquid crystal
The manufacture of technology, research and development aspect have put into many energy, and wherein tetra- color technology of Quattron is the innovation of Sharp in recent years
Point, past more common method are that a complete pixel is filled with three sub-pixels of red, green, blue, and Sharp
Quattron then increases yellow on its basis, and a pixel is filled with four sub-pixels, not only screen is allowed to become in this way
It is finer and smoother, and the quantity of color displays is considerably increased, improve saturation degree and over-colored uniformity.But Sharp is public
Four color display screens of department consume energy more taller than three color display screens after unlatching, do not have energy saving display technology.
Local dimming (Local Dimming) technology, which is commonly used, solves LCD backlight leakage phenomenon, to reach HDR
Purpose.Local dimming is the light emission luminance that LCD backlight unit (generally using LED) is controlled according to the brightness value of image: for
Dark image section reduces or thoroughly closes corresponding LEDs, reaches energy saving purpose；At the same time it can also solve due to liquid crystal light leakage
The disadvantage that dynamic range of images is low is caused, realizes the purpose of HDR.Since back light unit is without being always maintained at maximum luminousing brightness,
So local dimming technology also advantageously improves the efficiency of LCD.
Under RGB color domain space, RGB monochromatic light is generated using white backlight, using CFA using R, G and B separate backlight ratio
Scheme can reduce power consumption, so that efficiency is improved, because G and B color LED can be closed for example when being displayed in red picture material.
In addition, the extension of colour gamut coverage area can also be brought using RGB Unicolor back light.
As society is constantly progressive the continuous development with science and technology, energy problem has gradually attracted more and more people's
Eyeball, and develop the critical issue for being the progress of people's class and developing.Energy problem is fundamentally solved, in addition to finding newly
The energy, it is also current most directly effective important measures that energy conservation, which is crucial, so how to have on the basis of studying four primaries
Imitating energy saving also will be people's key problems-solving.
Have been developed that the energy-saving LED based on red, green, blue, white (RGBW) four kinds of primary color pixels structures is shown at this stage
System increases the sub- optical filter of white in current R, G, B CFA (Color Filter Array, CFA) structure, but is
Holding clarity does not reduce, and each sub-pixel unit area of four color CFA has to reduce, therefore reduce each sub-pixel
Light transmission capacity.
Summary of the invention
In view of the technical drawbacks of the prior art, it is an object of the present invention to provide a kind of energy conservations based on complementary color light
Display methods.
The technical solution adopted to achieve the purpose of the present invention is:
A kind of energy-saving displaying method based on complementary color light, comprising the following steps:
Position of certain coloured light in colour gamut is judged whether in predetermined point, if then by liquid crystal filter array Y, R, G, B tetra-
Primary colors is expressed and is shown；Conversely, then being expressed and being indicated with RGB three primary colors.
The predetermined point is D65 point.
Yellow liquid crystal filter is added in the liquid crystal filter array, the yellow filtered out can be filtered out with blue color filter
Blue it is complementary, to introduce second white light, in the case where not promoting power consumption to improve brightness.
Increase a yellow liquid crystal glistening light of waves piece in each three-color pixel, the yellow liquid crystal filter is placed in three-color pixel
Blue liquid crystal optical filter side.
Compared with prior art, the beneficial effects of the present invention are:
The present invention is by first judging position of the coloured light in colour gamut, if it is scheduled point, then just with Y, R, G, B this
Four kinds of primary colors are expressed and are shown, and if it is not belonging to this scheduled point, continue to be indicated with RGB three primary colors,
Maximum energy-saving effect can be reached in this way.
Detailed description of the invention
Fig. 1 show the flow chart of the energy-saving displaying method based on complementary color light；
Fig. 2 show the spectral luminous efficiency curve of photopic vision and noctovision.
Fig. 3 show position of the color Y (yellow) in gamut map；
Fig. 4 show position of the color Y in liquid crystal filter display；
Fig. 5 show 1931 chromatic diagram of CIE；
Fig. 6 show BT.2020 gamut map.
Specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, a kind of energy-saving displaying method based on complementary color light of the present invention, comprising the following steps:
Position of certain coloured light in colour gamut is judged whether in predetermined point, if then by liquid crystal filter array Y, R, G, B tetra-
Primary colors is expressed and is shown；Conversely, then being expressed and being indicated with RGB three primary colors.
Wherein, the predetermined point is D65 point, certain coloured light is white light.
It wherein, can be close to backlight when being displayed in white at this for that Y coloured light can be made complementary with blue light on D65 point
Original brightness, and then reach maximum energy-saving effect, and yellow liquid crystal filter is closed when showing other colors,
Accomplish that color is shown accurately with RGB expression color.
In this field, high-effect HDR (High Dynamic Range) show the starting point of equipment first is that, make full use of
The spectral luminous efficiency curve (luminous efficiency function) of human eye is keeping color with existing RGB three primary colors
The compatibility of color video system and under the premise of not reducing its colour gamut coverage area, needed for being realized using all available light sources
High peak brightness.
The backlight of present liquid crystal display is generally made of White LED, but RGB liquid crystal filter can filter out the big portion in addition to RGB
Light splitter causes maximum brightness to reduce.White light LEDs are usually to excite one or more kinds of fluorescent powders to be mixed by blue-ray LED
White light, and the electro-optical efficiency of blue light is very high, and the blue light ingredient of many displays is excessively high at present, since Age related macular becomes
Property it is related with blue light, so blue light and sodium yellow are formed white light, that is, being avoided that leads to AMD by blue light (Age related macular becomes
Property), and the white light peak brightness of display can be improved.
Major part white light LEDs is all to excite one or more kinds of fluorescent powders by blue-ray LED at present, finally by blue light and glimmering
The light that light powder issues mixes white light.Therefore the spectrum of general LED has more than two peak values, and other wave-length coverage phases
It is very low to radiation intensity.
In order to improve the absolute brightness of display screen, the D65 white point in colour gamut coverage area can be considered with R, G, B
And the 4th kind of coloured light-Y is expressed.White is generated there are two types of mode in this way, first is that green and a part of blue generates by red,
Second is that remaining a part blue and the 4th kind of coloured light -- blue complementary color yellow generates.And it then can be after when expressing other colors
It is continuous to use original scheme, i.e. RGB.In this way, the available very big raising of peak brightness of display white light.
Current RGB liquid crystal filter can only be through blue, and red and green, the yellow color component in White LED is also very big,
But this part generally can not penetrate RGB liquid crystal filter, while yellow is the complementary color of blue, the mixing of both color additivitys
Afterwards, white can be shown as in human eye, so bright using the peak value that this part can be improved 20% when showing white light
Brightness can be improved in degree when showing white, expands dynamic range.Below it is proposed that how to introduce this part, from
And reinforce overall brightness.
And visual effect is as caused by visible light stimulus human eye.If the radiant power of light is identical and wavelength is different, draw
The visual effect risen is also different.With the change of wavelength, not only color perception is different, but also brightness sensation is not also identical.For example,
Etc. Energy distributions spectrum in, it is yellow green that human eye, which feels most bright, and red then dark more.
In order to determine that human eye to the sensitivity of different wavelengths of light, can be surveyed in the case where generating same brightness feeling
The radiant power φ of various wavelength lights outV(λ).Obvious φV(λ) is bigger, illustrates that the light of the wavelength is less susceptible to be felt by human eye
Feel；And φV(λ) is smaller, then human eye is higher to its sensitivity.Thus φVThe inverse of (λ) can be used to measure vision to wavelength
For the sensitivity of the light of λ, referred to as spectral luminous efficacy, indicated with K (λ):
The light that it is 555nm to wavelength that actual measurement, which shows, there is maximum spectral luminous efficacy Km=K (555).Then, any wave
The spectral luminous efficacy K (λ) and K of long lightmThe ratio between be known as spectral luminous efficiency, and with function V (λ) expression:
V (λ)=ψV(555)/ψV(λ)
Wherein, V (λ) is no more than 1 number, that is to say, that feels to reach identical brightness, is in wavelength
When 555nm, the radiant power of institute's light requirement is minimum.
As wavelength is gradually increased or is reduced since the 555nm, required radiant power will constantly increase, in other words spectrum
Luminous efficacy constantly declines.Part photopic vision and noctovision spectral luminous efficiency, see the following table 1
Table 1
Table 1 lists the optimum data of the obtained spectral luminous efficiency of CIE in 1933 of part, the spectral light thus drawn
Apparent efficiency curve is as shown in Figure 2.The curve is also referred to as relative spectral sensitivity curve.If it illustrates that the radiant power of light is identical
And wavelength is different, then the brightness sensation of human eye will change according to curve law.
So increasing Y (yellow) liquid crystal filter 11 in traditional RGB filter array, optical filter is penetrated
Wavelength should correspond to the complementary color of blue peak, that is, Y point as shown in Figure 3, so as to accurately show white light, Y
11 arranged for interval of (yellow) liquid crystal filter is formed by Red lightscreening plate 12, green color filter 13 and blue color filter 14
The side of filter unit is arranged as shown in Figure 4.Increase a yellow liquid crystal in each three-color pixel, and places it in indigo plant
By dichroic liquid crystal, preferably to form white light.
Not only the high brightness but also color of high saturation seldom occurs actually in nature.So for high-brghtness picture images or height
Luminance picture region, other than common RGB colour mixture generates white light, extra blue is also used to generate white with its complementary color yellow
Light increases the generation channel an of white light, improves the peak brightness of white light.And it after additivity mixing, can drop
A possibility that senile macular degeneration caused by low blue light.
As seen in figs. 5-6, the curve enclosed region in Fig. 6 is to represent the Pointer colour gamut of real surface colour gamut, is target
Colour gamut.Y (=Yellow) and blue in Fig. 6 are mutually complementary color.Since X color is that (X in practical figure 6 above is one compound to yellow
Color, real spectrum color yellow are the Y in Fig. 6), and yellow and blue are mutually complementary color, that is to say, that yellow and blue pass through human brain
Additivity mixing after generate white light.And blue can also form white light with red and green, so there are two channel can and meanwhile shape
At white light, it is worth the purpose of brightness to peak.Although blue should be mixed with red and green light again with yellow light, to blue light
Brightness form high requirement, but the blue light ingredient of many displays is natively excessively high at present, so the blue light needed is very
It is easy that requirement can be reached.
Theoretically the complementary color light component of blue light can be determined in the color space CIELab.Blue light is transformed to
The color space CIELab { L, a, b }, since { L, 0,0 } is grey colour axis, { L ,-a ,-b } is required complementary color light component.Control
The light emission luminance of blue and its complementary color, can be obtained the different gray values between white light and black light.
According to the above results it is found that Y point position should determine near 570nm wavelength light, can make at this time Y coloured light with
Blue light is complementary, can be close to the original brightness of backlight when being displayed in white, and then reaches maximum energy-saving effect, and
Yellow filter is closed when showing other colors, accomplishes that color is shown accurately with RGB expression color.
The above is only a preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (4)
1. a kind of energy-saving displaying method based on complementary color light, which comprises the following steps:
Position of certain coloured light in colour gamut is judged whether in predetermined point, if then by liquid crystal filter array Y, R, G, B four primaries
It is expressed and is shown；Conversely, then being expressed and being indicated with RGB three primary colors.
2. the energy-saving displaying method as described in claim 1 based on complementary color light, which is characterized in that the predetermined point is D65 point.
3. the energy-saving displaying method as described in claim 1 based on complementary color light, which is characterized in that add in the liquid crystal filter array
Enter yellow liquid crystal filter, the blue that the yellow filtered out can be filtered out with blue color filter is complementary, thus not promoting power consumption
In the case where introduce second white light, to improve brightness.
4. the energy-saving displaying method as described in claim 1 based on complementary color light, which is characterized in that increase in each three-color pixel
One yellow liquid crystal glistening light of waves piece, the yellow liquid crystal filter are placed in the side of the blue liquid crystal optical filter of three-color pixel.
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Cited By (1)
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| CN114395153A (en) * | 2021-12-28 | 2022-04-26 | 宁波信泰机械有限公司 | White light transmitting composite film layer and preparation method and application thereof |
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