CN100543556C - Lcd - Google Patents

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CN100543556C
CN100543556C CNB2007101993350A CN200710199335A CN100543556C CN 100543556 C CN100543556 C CN 100543556C CN B2007101993350 A CNB2007101993350 A CN B2007101993350A CN 200710199335 A CN200710199335 A CN 200710199335A CN 100543556 C CN100543556 C CN 100543556C
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filter layer
lcd
backlight module
substrates
blue color
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CN101178517A (en
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王俊杰
周玉蕙
徐雅玲
林俊良
廖烝贤
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AU Optronics Corp
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Abstract

The present invention relates to a kind of LCD, it comprises backlight module and display panels.Backlight module has at least one white light source, BL 1With BL 2The luminous frequency spectrum of standardization of representing backlight module respectively is between wavelength 500 nanometer to 520 nanometers and the high-high brightness peak value between wavelength 445 nanometer to 465 nanometers, wherein 0.91≤BL 1/ BL 2≤ 0.99.Display panels is disposed at the backlight module top, and display panels comprises two substrates and the liquid crystal layer between substrate, wherein substrate one of them have redness, green and blue color filter layer, the CIE 1931 chromaticity coordinates numerical value of red, green and blue color filter layer satisfy pre-defined relation.Utilize the luminous frequency spectrum of definition backlight module and the chromaticity coordinate of each chromatic filter layer to satisfy particular kind of relationship, the color representation of the LCD that the present invention proposes can be taken into account color saturation and white spot color temperature.

Description

LCD
Technical field
The present invention relates to a kind of display, and be particularly related to a kind of LCD.
Background technology
Have that high image quality, space utilization efficient are good, (Liquid Crystal Display LCD) becomes the main flow of display to the LCD of low consumpting power, advantageous characteristic such as radiationless gradually.Along with popularizing of LCD, the important indicator of consumer when buying LCD is high color reappearance (colorreproduction).In order to satisfy the demands of consumers, the LCD of the high color reproducing technology of various employings appears on the market in succession.
LCD is mainly by display panels and provide the backlight module of display panels light source to be formed, wherein display panels for example comprise active elements array substrates, colored filter and be disposed at active elements array substrates and colored filter between liquid crystal layer.Generally speaking, the light source in the backlight module can adopt cold-cathode fluorescence lamp (Cold-Cathode Fluorescent Lamp, CCFL), light emitting diode or the light source of other kind.Is example with cathode fluorescent tube as the white light source in the backlight module, the color saturation NTSC of LCD is than the level that roughly can reach 70% to 75% at present, wherein color saturation NTSC ratio be with NTSC (National TelevisionSystem Committee, NTSC) fixed standard weigh color saturation.
Chromaticity coordinate variation diagram when Figure 1A is plotted in the high color reproducing technology of exploitation LCD according to known technology.Please refer to Figure 1A, by changing the kind of fluorescent powder in the cold-cathode fluorescence lamp, for example intensity peak is replaced with the green emitting phosphor of intensity peak between 510 nanometer to 520 nanometers between the green emitting phosphor of 540 nanometer to 550 nanometers, can be so that adjusted LCD be promoted in the performance of color saturation, but then, but cause the white spot color temperature skew of adjusted LCD, and then make the color representation distortion of LCD.
In order to address the above problem, chromaticity coordinate variation diagram when being plotted in the high color reproducing technology of exploitation LCD according to another kind of known technology as Figure 1B, by adjusting the ratio of red fluorescence powder, green emitting phosphor and blue colour fluorescent powder in the cold-cathode fluorescence lamp, can be so that the performance of the white spot color temperature of adjusted LCD be promoted, but then, but lost color saturation.
In sum, how when promoting color saturation, take into account a big problem of the high color reproducing technology of white spot color temperature performance having become of LCD.
Summary of the invention
In view of this, the invention provides a kind of LCD, it takes into account the white spot color temperature performance of LCD when promoting color saturation.
LCD proposed by the invention comprises backlight module and display panels; Wherein backlight module has at least one white light source, and with BL 1With BL 2The luminous frequency spectrum of standardization of representing backlight module respectively is between wavelength 500 nanometer to 520 nanometers and the high-high brightness peak value between wavelength 445 nanometer to 465 nanometers, wherein 0.91≤BL 1/ BL 2≤ 0.99.Display panels is disposed at the backlight module top, and display panels comprises two substrates and the liquid crystal layer between substrate, wherein substrate one of them have red filter layer, green filter layer and blue color filter layer, and red filter layer, green filter layer and blue color filter layer satisfy the following relationship formula:
(1)R x≥0.655；(2)G x≥0.275；(3)B y≤0.075；
R wherein xBe defined as red filter layer under illuminant-C, the x coordinate values on CIE 1931 chromaticity coordinatess, G xBe defined as green filter layer under illuminant-C, the x coordinate values on CIE 1931 chromaticity coordinatess, B yBe defined as blue color filter layer under illuminant-C, the y coordinate values on CIE 1931 chromaticity coordinatess.
The present invention also proposes a kind of LCD, and it comprises backlight module and display panels; Wherein backlight module has at least one white light source, and with BL 1With BL 2The luminous frequency spectrum of standardization of representing backlight module respectively is between wavelength 500 nanometer to 520 nanometers and the high-high brightness peak value between wavelength 445 nanometer to 465 nanometers, wherein BL 1/ BL 2≤ 0.65.Display panels is disposed at the backlight module top, and display panels comprises two substrates and the liquid crystal layer between substrate, wherein substrate one of them have red filter layer, green filter layer and blue color filter layer, and red filter layer, green filter layer and blue color filter layer satisfy the following relationship formula:
(1)R x≥0.655；(2)G x≥0.275；(3)B y≤0.075；
R wherein xBe defined as red filter layer under illuminant-C, the x coordinate values on CIE 1931 chromaticity coordinatess, G xBe defined as green filter layer under illuminant-C, the x coordinate values on CIE 1931 chromaticity coordinatess, B yBe defined as blue color filter layer under illuminant-C, the y coordinate values on CIE 1931 chromaticity coordinatess.
In one embodiment of this invention, backlight module comprises direct type backlight module or side incident type backlight module.
In one embodiment of this invention, white light source is a white light emitting diode.
In one embodiment of this invention, white light source is a cathode fluorescent tube, wherein have multiple phosphor material powder on the cathode fluorescent tube inwall, and phosphor material powder comprises red light fluorescent powder, green light fluorescent powder and blue light fluorescent powder.
In one embodiment of this invention, two substrates comprise thin-film transistor array base-plate and colored optical filtering substrates.In other embodiments, two substrates comprise COA (Color Filter On Array) substrate and the subtend substrate with common electrode.In another embodiment, two substrates comprise AOC (ArrayOn Color Filter) substrate and the subtend substrate with common electrode.
In sum, in LCD of the present invention, distribute by the main brightness peak in the luminous frequency spectrum of standardization of control backlight module, the pairing chromatic filter layer of collocation in good time again can be used as the criterion of the color representation of adjusting LCD.In other words, utilize the luminous frequency spectrum of definition backlight module and the chromaticity coordinate of each chromatic filter layer to satisfy particular kind of relationship, the color representation of LCD can be taken into account color saturation and white spot color temperature.
Description of drawings
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Figure 1A draws a kind of chromaticity coordinate variation diagram when the high color reproducing technology of exploitation LCD according to known technology.
The chromaticity coordinate variation diagram of Figure 1B when being plotted in the high color reproducing technology of exploitation LCD according to another kind of known technology.
Fig. 2 is the synoptic diagram of first embodiment of LCD of the present invention.
Fig. 3 A is the luminous spectrum diagram of standardization of backlight module of the present invention.
Fig. 3 B is the CIE 1931 chromaticity coordinate figure of some actual measurements among first embodiment of LCD of the present invention.
Fig. 4 is the synoptic diagram of another kind of LCD of the present invention.
Fig. 5 is number of C IE 1931 chromaticity coordinate figure among second embodiment of LCD of the present invention.
And each description of reference numerals in the above-mentioned accompanying drawing is as follows:
100,200 LCD
110,210 backlight modules
120 display panels
112,212 white light sources
126 liquid crystal layers
124 thin-film transistor array base-plates
122 colored optical filtering substrates
The 122R red filter layer
The green filter layer of 122G
The 122B blue color filter layer
BL 1High-high brightness peak value between luminous frequency spectrum medium wavelength 500 nanometer to 520 nanometers
BL 2High-high brightness peak value between luminous frequency spectrum medium wavelength 445 nanometer to 465 nanometers
R xThe x axle chromaticity coordinate numerical value of red filter layer
G xThe x axle chromaticity coordinate numerical value of green filter layer
B yThe y axle chromaticity coordinate numerical value of blue color filter layer
Embodiment
First embodiment
Fig. 2 is the synoptic diagram of LCD of the present invention.Please refer to Fig. 2, LCD 100 comprises backlight module 110 and display panels 120, and wherein backlight module 110 for example is direct type backlight module or side incident type backlight module.Backlight module 110 has at least one white light source 112, and the light that white light source 112 is sent is through behind the blooming piece, from backlight module 110 outgoing to display panels.These after program through its luminous frequency spectrum of standardization, define BL by the light of backlight module outgoing 1Be the high-high brightness peak value between wavelength 500 nanometer to 520 nanometers, and BL 2Be the high-high brightness peak value between wavelength 445 nanometer to 465 nanometers, wherein the method with luminous spectrum standardization for example is that the high-high brightness peak value in the luminous frequency spectrum is decided to be 1.0.In addition, in the present embodiment, white light source 112 is to be example with the cathode fluorescent tube, wherein has multiple phosphor material powder on the cathode fluorescent tube inwall, for example red light fluorescent powder, green light fluorescent powder and blue light fluorescent powder are in order to optical properties such as the brightness of adjusting white light source, colourities.In other embodiments, white light source 112 also can be a white light emitting diode.
Please continue with reference to Fig. 2, display panels 120 is disposed at backlight module 110 tops, and display panels 120 comprises two substrates and the liquid crystal layer between substrate 126.As shown in Figure 2, two substrates can be thin-film transistor array base-plate 124 and colored optical filtering substrates 122, and wherein colored optical filtering substrates 122 has red filter layer 122R, green filter layer 122G and blue color filter layer 122B.Certainly, in other embodiments, two substrates also can be a COA substrate and the subtend substrate with common electrode, or are made up of an AOC substrate and the subtend substrate with common electrode.Definite, with use the CIE of International Commission on Illumination fixed standard illuminants (illuminant-C) when measuring red filter layer 122R, green filter layer 122G and blue color filter layer 122B, red filter layer 122R, green filter layer 122G and blue color filter layer 122B satisfy the following relationship formula:
(1)R x≥0.655；
(2)G x≥0.275；
(3)B y≤0.075；
R wherein xBe defined as red filter layer 122R under illuminant-C, the x coordinate values on CIE 1931 chromaticity coordinatess, G xBe defined as green filter layer 122G under illuminant-C, the x coordinate values on CIE 1931 chromaticity coordinatess, B yBe defined as blue color filter layer 122B under illuminant-C, the y coordinate values on CIE 1931 chromaticity coordinatess.
Fig. 3 A is the luminous spectrum diagram of standardization of backlight module of the present invention.Please refer to Fig. 3 A, BL 1With BL 2The luminous frequency spectrum of standardization of representing backlight module 110 respectively is between wavelength 500 nanometer to 520 nanometers and the high-high brightness peak value between wavelength 445 nanometer to 465 nanometers.It should be noted that in the present embodiment the luminous frequency spectrum of backlight module 110 satisfies 0.91≤BL 1/ BL 2≤ 0.99 relational expression, and the red filter layer 122R in the display panels 120, green filter layer 122G and blue color filter layer 122B also satisfy the following relationship formula: (1) R x〉=0.655; (2) G x〉=0.275; (3) B y≤ 0.075.Particularly, when the backlight module 110 that satisfies above-mentioned particular kind of relationship formula is done collocation with display panels 120, can be so that the white spot color temperature of LCD 100 be essentially 6500K, and color saturation NTSC is than the level that reaches 92%～95%.The color representation of some data aid illustration LCD below will be proposed.
Table one
Figure C200710199335D00081
In detail, table one is enumerated the chromaticity coordinate measured data of the LCD 100 in several present embodiments.See also table one, LCD A, B, C, D, E use the backlight module of different luminous frequency spectrums respectively, wherein each backlight module 110 pairing BL 1With BL 2The numerical value difference.Then, with these backlight modules and after satisfying the display panels 120 do collocation of particular kind of relationship, can record the chromaticity coordinate data of LCD A, B, C, D, E respectively; Wherein Wx and Wy represent x coordinate values and the y coordinate values of white point on CIE1931 chromaticity coordinate figure of LCD 100 respectively.Those skilled in the art can do mutual computing with chromaticity coordinate numerical value and the white spot color temperature numerical value of Wx and Wy.For example, white spot color temperature 6500K is scaled chromaticity coordinate numerical value after, the central value of Wx and Wy is essentially 0.313 and 0.329.On the practice, when the deviser is controlled in the numerical value of Wx and Wy respectively in the scope of Wx ± 0.015 and Wy ± 0.015, the white spot color temperature that LCD 100 is presented is essentially 5600K to 7500K, and above-mentioned white spot color temperature range of control also is the design object of the certain applications product of LCD 100 usually.
Fig. 3 B is the CIE 1931 chromaticity coordinate figure of each LCD in the table one.Please be simultaneously with reference to table one and Fig. 3 B, (Wx Wy) all falls within the scope of (0.313 ± 0.015,0.329 ± 0.015) the chromaticity coordinate numerical value of LCD A, B, C, D, E.In other words, the luminous frequency spectrum when backlight module 110 satisfies 0.91≤BL 1/ BL 2≤ 0.99, and the red filter layer 122R of display panels 120, green filter layer 122G and blue color filter layer 122B are when satisfying the following relationship formula: (1) R x〉=0.655; (2) G x〉=0.275; (3) B y≤ 0.075, the color representation excellence of LCD 100, its white spot color temperature is essentially 6500K, and color saturation NTSC is than the level that can reach 92%～95%.Therefore, for the product that white spot color temperature requires 6500K, desktop LCD screen for example, present embodiment can provide the color representation criterion of LCD when high color reproducing technology is developed, and then makes LCD be taken into account color saturation and white spot color temperature on color representation.
Second embodiment
On other application products of LCD, the design object of white spot color temperature is essentially 10000K, for example LCD TV.Therefore, the present invention proposes a kind of LCD 200 in addition.Fig. 4 is the synoptic diagram of another kind of LCD of the present invention.Please refer to Fig. 4, LCD 200 comprises backlight module 210 and display panels 120.The LCD 200 of present embodiment is similar with the LCD 100 of Fig. 2, but the two difference is the luminous frequency spectrum of backlight module 210.In the present embodiment, backlight module 210 has at least one white light source 212, BL 1With BL 2The luminous frequency spectrum of standardization of representing backlight module 210 respectively is between wavelength 500 nanometer to 520 nanometers and the high-high brightness peak value between wavelength 445 nanometer to 465 nanometers, wherein BL 1/ BL 2≤ 0.65.All the other members and first embodiment are similar, repeat no more.
It should be noted that in the present embodiment the luminous frequency spectrum of backlight module 210 satisfies BL 1/ BL 2≤ 0.65 relational expression, and the red filter layer 122R in the display panels 120, green filter layer 122G and blue color filter layer 122B satisfy the following relationship formula, (1) R x〉=0.655; (2) G x〉=0.275; (3) B y≤ 0.075, the backlight module 210 that satisfies particular kind of relationship is arranged in pairs or groups with display panels 120, can be so that the white spot color temperature of LCD 200 reach 10000K in fact, and color saturation NTSC ratio is essentially 92%～95%.
Table two is enumerated the chromaticity coordinate measured data of the LCD of several present embodiments.In table two, LCD F, G use the backlight module 210 of different luminous frequency spectrums respectively, wherein each backlight module 210 pairing BL 1With BL 2The numerical value difference.Then, with backlight module 210 and after satisfying the display panels 120 do collocation of particular kind of relationship, can record the chromaticity coordinate numerical value of LCD F, G respectively.In detail; after white spot color temperature 10000K was scaled chromaticity coordinate numerical value, the central value of Wx and Wy was essentially 0.28 and 0.29, and the deviser usually can be with (Wx on the practice; Wy) design object numerical value is controlled in respectively within the scope of (0.28 ± 0.015,0.29 ± 0.015).
Table two
Figure C200710199335D00101
Fig. 5 is the CIE 1931 chromaticity coordinate figure of each LCD of table two.Please be simultaneously with reference to table two and Fig. 5, the chromaticity coordinate numerical value of LCD F, G all falls within the scope of (0.28 ± 0.015,0.29 ± 0.015).In other words, the luminous frequency spectrum when backlight module 210 satisfies BL 1/ BL 2≤ 0.65, and the red filter layer 122R of display panels 120, green filter layer 122G and blue color filter layer 122B are when satisfying following relationship: (1) R x〉=0.655; (2) G x〉=0.275; (3) B y≤ 0.075, the color representation excellence of LCD 200, its white spot color temperature is essentially 10000K, and color saturation NTSC ratio can reach 92%～95%.Therefore, in the certain applications of LCD 200, require the product of 10000K for white spot color temperature, LCD TV etc. for example, present embodiment can provide the color representation criterion of LCD when high color reproducing technology is developed, and then makes the color representation of LCD be taken into account color saturation and white spot color temperature.
In sum, in LCD of the present invention, by the luminous frequency spectrum of control backlight module, the in good time pairing chromatic filter layer of collocation again can be used as the criterion of the color representation of adjusting LCD.In other words, the chromaticity coordinate of luminous frequency spectrum by the definition backlight module and corresponding chromatic filter layer satisfies particular kind of relationship, and the color representation of LCD can be taken into account color saturation and white spot color temperature.
Though the present invention with embodiment openly as above; but it is not in order to limit the present invention; any those skilled in the art without departing from the spirit and scope of the present invention, when can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking the scope that claim defined of enclosing.

Claims (9)

1. LCD comprises:
Backlight module has at least one white light source, and with BL 1With BL 2The luminous frequency spectrum of standardization of representing this backlight module respectively is between wavelength 500 nanometer to 520 nanometers and the high-high brightness peak value between wavelength 445 nanometer to 465 nanometers, wherein 0.91≤BL 1/ BL 2≤ 0.99; And
Display panels, be disposed at this backlight module top, this display panels comprises two substrates and the liquid crystal layer between described two substrates, one of them has red filter layer, green filter layer and blue color filter layer wherein said two substrates, and this red filter layer, this green filter layer and this blue color filter layer satisfy the following relationship formula:
R x≥0.655
G x≥0.275
B y≤0.075
R wherein xBe defined as this red filter layer under illuminant-C, the x coordinate values on CIE 1931 chromaticity coordinatess, G xBe defined as this green filter layer under illuminant-C, the x coordinate values on CIE 1931 chromaticity coordinatess, B yBe defined as this blue color filter layer under illuminant-C, the y coordinate values on CIE 1931 chromaticity coordinatess.
2. LCD as claimed in claim 1, wherein this backlight module comprises direct type backlight module or side incident type backlight module.
3. LCD as claimed in claim 1, wherein this white light source is a white light emitting diode.
4. LCD as claimed in claim 1, wherein this white light source is a cathode fluorescent tube.
5. LCD as claimed in claim 4 wherein has multiple phosphor material powder on this cathode fluorescent tube inwall.
6. LCD as claimed in claim 5, wherein said a plurality of phosphor material powders comprise red light fluorescent powder, green light fluorescent powder and blue light fluorescent powder.
7. LCD as claimed in claim 1, wherein said two substrates comprise thin-film transistor array base-plate and colored optical filtering substrates, wherein colored optical filtering substrates has red filter layer, green filter layer and blue color filter layer.
8. LCD comprises:
Backlight module has at least one white light source, and with BL 1With BL 2The luminous frequency spectrum of standardization of representing this backlight module respectively is between wavelength 500 nanometer to 520 nanometers and the high-high brightness peak value between wavelength 445 nanometer to 465 nanometers, wherein BL 1/ BL 2≤ 0.65; And
Display panels, be disposed at this backlight module top, and this display panels comprises two substrates and the liquid crystal layer between described two substrates, one of them has red filter layer, green filter layer and blue color filter layer wherein said two substrates, and this red filter layer, this green filter layer and this blue color filter layer satisfy the following relationship formula:
R x≥0.655
G x≥0.275
B y≤0.075
R wherein xBe defined as this red filter layer under illuminant-C, the x coordinate values on CIE 1931 chromaticity coordinatess, G xBe defined as this green filter layer under illuminant-C, the x coordinate values on CIE 1931 chromaticity coordinatess, B yBe defined as this blue color filter layer under illuminant-C, the y coordinate values on CIE 1931 chromaticity coordinatess.
9. LCD as claimed in claim 8, wherein said two substrates comprise thin-film transistor array base-plate and colored optical filtering substrates, wherein colored optical filtering substrates has red filter layer, green filter layer and blue color filter layer.
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Title
滤色器的制造技术. 王景义.微细加工技术，第1期. 1994
滤色器的制造技术. 王景义.微细加工技术，第1期. 1994 *

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