CN101984373A - Liquid crystal display (LCD) device - Google Patents

Liquid crystal display (LCD) device Download PDF

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Publication number
CN101984373A
CN101984373A CN2010102999267A CN201010299926A CN101984373A CN 101984373 A CN101984373 A CN 101984373A CN 2010102999267 A CN2010102999267 A CN 2010102999267A CN 201010299926 A CN201010299926 A CN 201010299926A CN 101984373 A CN101984373 A CN 101984373A
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China
Prior art keywords
filter layer
backlight
liquid crystal
wavelength
nanometers
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CN2010102999267A
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王英力
刘韵宜
林俊良
陈建凯
廖烝贤
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AU Optronics Corp
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AU Optronics Corp
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Priority to CN2010102999267A priority Critical patent/CN101984373A/en
Publication of CN101984373A publication Critical patent/CN101984373A/en
Priority to CN 201110108621 priority patent/CN102346330B/en
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Abstract

The invention discloses a liquid crystal display (LCD) device which comprises a backlight source and an LCD panel. The luminescent frequency spectrum of the backlight source has relatively great brightness peak values when the wavelength is 460-480nm, 505-525nm and 610-630nm. The LCD panel is arranged above the backlight source and is provided with a red optical filter layer (Rx, Ry, RY), a green optical filter layer (Gx, Gy, GY), a blue optical filter layer (Bx, By, BY) and a yellow optical filter layer (Yx, Yy, YY), wherein, under the backlight source, the red optical filter layer, the green optical filter layer, the blue optical filter layer and the yellow optical filter layer meet the conditions as follows: Rx is not less than 0.654; Ry is not more than 0.330; Gx is not more than 0.253; Gy is not less than 0.605; Bx is not more than 0.136; By is not more than 0.146; Yx is not more than 0.408; Yy is not more than 0.534; RY/GY is not less than 0.83 and not more than 0.87; GY/BY is not less than 0.86 and not more than 0.92; BY/YY is not less than 0.83 and not more than 0.87; and YY/RY is not less than 1.5 and not more than 1.55.

Description

Liquid crystal indicator
Technical field
The present invention relates to a kind of liquid crystal indicator, and relate in particular to a kind of to have the liquid crystal indicator of excellent color saturation degree (color saturation).
Background technology
Because liquid crystal indicator (Liquid Crystal Display, LCD) possess that volume is little, high image quality, low consumpting power, advantage such as radiationless, (Cathode RayTube, CRT) display device becomes the main flow of display device to have surmounted traditional cathode-ray tube (CRT) in recent years.Yet, to compare with CRT display, liquid crystal indicator needs the backlight can show image usually.General liquid crystal indicator backlight commonly used has cold-cathode fluorescence lamp (Cold-Cathode Fluorescent Lamp, CCFL) backlight and back light source in LED.
White light emitting diode has, and thermal value is low, power saving, but the life-span is long, reaction velocity is fast, volume is little and advantage such as planar package, and it a white-light illuminating revolution occurs being regarded as.And aspect application market, white light emitting diode because of its power saving, volume is little and reaction velocity is fast etc., and advantage is used on the backlight module of portable display device and TV gradually.Yet, general white light emitting diode commonly used adopts the blue LED chip collocation to go up yttroalumite pomegranate powder (Yttrium Aluminum Garnet more, YAG), though it has the convenient and little advantage of volume of encapsulation, it still is apparent not enough in the performance of color saturation.In addition, because white light emitting diode is a pointolite, the multi-disc blooming piece (as diffusion sheet, light guide plate, brightening piece etc.) of therefore must arranging in pairs or groups can present uniform surface light source, causes the integral thickness of backlight and manufacturing cost to be difficult to reduce.
In recent years, existing many developers propose with the design concept of organic EL component as backlight, to reduce the use of blooming piece, Fig. 1 is the frequency spectrum that Eastman Kodak company develops two kinds of organic electroluminescent element OLED-1, OLED-2, and Fig. 2 is for using organic electroluminescent element OLED-1, the OLED-2 CIE 1931 chromaticity coordinate figure (chromaticity diagram) as the liquid crystal indicator of backlight.
As the organic electroluminescent element OLED-1, the OLED-2 that use Eastman Kodak company during as backlight, (x y) is recorded in the following table with lightness (Y) chromaticity coordinates of the shown redness of liquid crystal indicator, green, blueness, white.In addition, the color saturation of liquid crystal indicator (NTSC%) also is recorded in the following table.
? Rx? Ry? RY? Gx? Gy? GY? Bx? By? By? Wx? Wy? WY? NTSC％?
Patent?OLED1 0.639? 0.337? 5.29? 0.250? 0.580? 14.77? 0.139? 0.064? 3.22? 0.255? 0.254? 7.76? 72.1?
Patent?OLED2 0.646? 0.343? 7.56? 0.259? 0.544? 13.27? 0.120? 0.112? 2.99? 0.325? 0.326? 7.94? 61.7?
As can be known from the above table, as the organic electroluminescent element OLED-1 that uses Eastman Kodak company and OLED-2 during as backlight, the chromaticity coordinates of the white that liquid crystal indicator is shown is respectively (0.255,0.254) and (0.325,0.326), with the white chromaticity coordinates (0.28,0.29) in the general tv product evident difference is arranged.In addition, as the organic electroluminescent element OLED-1 that uses Eastman Kodak company and OLED-2 during as backlight, the color saturation of liquid crystal indicator (NTSC%) only was respectively for 72.1% and 61.7% (as shown in Figure 2).Clearly, as the organic electroluminescent element OLED-1 that uses Eastman Kodak company and OLED-2 during, can face the problem that the not good and white chromaticity coordinates of color saturation does not meet expection as backlight.
Summary of the invention
Technical matters to be solved by this invention provides a kind of liquid crystal indicator, and it has good color saturation and white appearance.
The invention provides a kind of liquid crystal indicator, it comprises a backlight and a display panels.The luminous frequency spectrum of backlight has the relative maximum brightness peak between 505 nanometer to 525 nanometers and wavelength between 460 nanometer to 480 nanometers, wavelength at wavelength between 610 nanometer to 630 nanometers.Display panels is disposed at the backlight top, and display panels has a red filter layer, a green filter layer, a blue color filter layer and a Yellow filter layer, and aforesaid red filter layer, green filter layer, blue color filter layer, Yellow filter layer satisfy following condition: under backlight, the x coordinate of red filter layer on CIE 1931 chromaticity coordinates is R x, the y coordinate is R y, lightness is RY, and R x〉=0.654, R y≤ 0.330; Under backlight, the x coordinate of green filter layer on CIE 1931 chromaticity coordinates is G x, the y coordinate is G y, lightness is GY, wherein G x≤ 0.253, G y〉=0.605, and 0.83≤RY/GY≤0.87; Under backlight, the x coordinate of blue color filter layer on CIE 1931 chromaticity coordinates is B x, the y coordinate is B y, lightness is BY, wherein B x≤ 0.136, B y≤ 0.146, and 0.86≤GY/BY≤0.92; And under backlight, the x coordinate of Yellow filter layer on CIE 1931 chromaticity coordinates is Y x, the y coordinate is Y y, lightness is YY, wherein Y x≤ 0.408, Y y≤ 0.534, and 0.83≤BY/YY≤0.87, and 1.5≤YY/RY≤1.55.
In an embodiment of the present invention, aforesaid backlight is an organic electroluminescent element.
In an embodiment of the present invention, backlight has relative maximum brightness peak BL1 at wavelength between 460 nanometer to 480 nanometers, backlight has relative maximum brightness peak BL2 at wavelength between 505 nanometer to 525 nanometers, backlight has relative maximum brightness peak BL3 at wavelength between 610 nanometer to 630 nanometers, and BL1: BL2: BL3=0.97: 0.99: 0.77.
In an embodiment of the present invention, backlight is about 470 nanometers at wavelength and has relative maximum brightness peak BL1, backlight is about 515 nanometers at wavelength and has relative maximum brightness peak BL2, backlight is about 620 nanometers at wavelength and has relative maximum brightness peak BL3, and BL1: BL2: BL3=0.97: 0.99: 0.77.
In an embodiment of the present invention, R x+ G y+ B y+ Y y〉=1.939.
In an embodiment of the present invention, 0.664 〉=R x〉=0.654,0.330 〉=R y〉=0.320,0.253 〉=G x〉=0.243,0.615 〉=G y〉=0.605,0.136 〉=B x〉=0.126,0.146 〉=B y〉=0.136,0.408 〉=Y x〉=0.398, and 0.534 〉=Y y〉=0.524.
In sum, the present invention adopts luminous frequency spectrum to have the backlight of relative maximum brightness peak between 505 nanometer to 525 nanometers and wavelength between 460 nanometer to 480 nanometers, wavelength at wavelength between 610 nanometer to 630 nanometers, and make red filter layer, green filter layer, blue color filter layer, Yellow filter layer under this backlight, present specific chromaticity coordinates and lightness, so that the shown white chromaticity coordinates of liquid crystal indicator is more near (0.28,0.29).
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 develops the frequency spectrum of two kinds of organic electroluminescent element OLED-1, OLED-2 for Eastman Kodak company.
Fig. 2 is for using organic electroluminescent element OLED-1, the OLED-2 CIE 1931 chromaticity coordinate figure as the liquid crystal indicator of backlight.
Fig. 3 is the synoptic diagram of the liquid crystal indicator of one embodiment of the invention.
Fig. 4 is a backlight source spectrum among Fig. 3.
Fig. 5 A is the frequency spectrum that penetrates of red filter layer among Fig. 3, green filter layer, blue color filter layer.
Fig. 5 B is the frequency spectrum that penetrates of Yellow filter layer among Fig. 3.
Fig. 6 is the CIE 1931 chromaticity coordinate figure of the liquid crystal indicator of use present embodiment.
Wherein, Reference numeral:
100: liquid crystal indicator
110: backlight
120: display panels
120R: red filter layer
120G: green filter layer
120B: blue color filter layer
120Y: Yellow filter layer
BL1, BL2, BL3: relative maximum brightness peak
BL R, BL G, BL B: the relative maximum peak value
Embodiment
Fig. 3 is the synoptic diagram of the liquid crystal indicator of one embodiment of the invention, and Fig. 4 is a backlight source spectrum among Fig. 3.Please refer to Fig. 3 and Fig. 4, the liquid crystal indicator 100 of present embodiment comprises a backlight 110 and a display panels 120.Backlight 110 for example is an organic electroluminescent element, and the luminous frequency spectrum of backlight 110 has the relative maximum brightness peak between 505 nanometer to 525 nanometers and wavelength between 460 nanometer to 480 nanometers, wavelength at wavelength between 610 nanometer to 630 nanometers, as shown in Figure 4.In the present embodiment, backlight 110 has relative maximum brightness peak BL 1 at wavelength between 460 nanometer to 480 nanometers, backlight 110 has relative maximum brightness peak BL2 at wavelength between 525 nanometer to 525 nanometers, backlight 110 has relative maximum brightness peak BL3 at wavelength between 610 nanometer to 630 nanometers, and BL1: BL2: BL3=0.97: 0.99: 0.77.For example, backlight 110 is about 470 nanometers at wavelength and has relative maximum brightness peak BL1, backlight 110 is about 515 nanometers at wavelength and has relative maximum brightness peak BL2, backlight 110 is about 620 nanometers at wavelength and has relative maximum brightness peak BL3, and BL1: BL2: BL3=0.97: 0.99: 0.77.
As can be seen from Figure 3, display panels 120 is disposed at backlight 110 tops, and display panels 120 has a red filter layer 120R, a green filter layer 120G, a blue color filter layer 120B and a Yellow filter layer 120Y, and aforesaid red filter layer 120R, green filter layer 120G, blue color filter layer 120B and Yellow filter layer 120Y satisfy following condition:
Red filter layer 120R
Backlight 110 times, the x coordinate of red filter layer 120R on CIE 1931 chromaticity coordinates is R x, the y coordinate is R y, lightness is RY, and R x〉=0.654, R y≤ 0.330.In other words, under backlight 110 irradiations of the frequency spectrum with Fig. 4, the chromaticity coordinates that passes the ruddiness of red filter layer 120R is (R x, R y), and the lightness of this ruddiness is RY.In a preferred embodiment, 0.664 〉=R x〉=0.654,0.330 〉=R y〉=0.320.
Green filter layer 120G
Backlight 110 times, the x coordinate of green filter layer 120G on CIE 1931 chromaticity coordinates is G x, the y coordinate is G y, lightness is GY, wherein G x≤ 0.253, G y〉=0.605, and 0.83≤RY/GY≤0.87.In other words, under backlight 110 irradiations of the frequency spectrum with Fig. 4, the chromaticity coordinates that passes the green glow of green filter layer 120G is (G x, G y), and the lightness of this green glow is GY.In a preferred embodiment, 0.253 〉=G x〉=0.243,0.615 〉=G y〉=0.605.
Blue color filter layer 120B
Backlight 110 times, the x coordinate of blue color filter layer 120B on CIE 1931 chromaticity coordinates is B x, the y coordinate is B y, lightness is BY, wherein B x≤ 0.136, B y≤ 0.146, and 0.86≤GY/BY≤0.92.In other words, under backlight 110 irradiations of the frequency spectrum with Fig. 4, the chromaticity coordinates that passes the blue light of blue color filter layer 120B is (B x, B y), and the lightness of this blue light is BY.In a preferred embodiment, 0.136 〉=B x〉=0.126,0.146 〉=B y〉=0.136.
Yellow filter layer 120B
Backlight 110 times, the x coordinate of Yellow filter layer 120Y on CIE 1931 chromaticity coordinates is Y x, the y coordinate is Y y, lightness is YY, wherein Y x≤ 0.408, Y y≤ 0.534, and 0.83≤BY/YY≤0.87, and 1.5≤YY/RY≤1.55.In other words, under backlight 110 irradiations of the frequency spectrum with Fig. 4, the chromaticity coordinates that passes the green glow of green filter layer 120G is (Y x, Y y), and the lightness of this green glow is YY.In a preferred embodiment, 0.408 〉=Y x〉=0.398, and 0.534 〉=Y y〉=0.524.
Generally speaking, in one embodiment of this invention, the x coordinate of red filter layer 120R on CIE 1931 chromaticity coordinates is R x, the y coordinate of green filter layer 120G on CIE 1931 chromaticity coordinates be G y, the y coordinate of blue color filter layer 120B on CIE 1931 chromaticity coordinates be B yAnd the y coordinate of Yellow filter layer 120Y on CIE 1931 chromaticity coordinates is Y yMust satisfy R x+ G y+ B y+ Y y〉=1.919 relational expression.In a preferred embodiment, must satisfy R x+ G y+ B y+ Y y〉=1.939 relational expression
Fig. 5 A is the frequency spectrum that penetrates of red filter layer 120R, green filter layer 120G, blue color filter layer 120B among Fig. 3, and Fig. 5 B is the frequency spectrum that penetrates of Yellow filter layer 120Y among Fig. 3.From Fig. 5 A and Fig. 5 B as can be known, red filter layer 120R has relative maximum peak value BL at wavelength between 700 nanometer to 730 nanometers R, green filter layer 120G has relative maximum peak value BL at wavelength between 520 nanometer to 550 nanometers G, blue color filter layer 120B has relative maximum peak value BL at wavelength between 450 nanometer to 470 nanometers B, and Yellow filter layer 120Y has relative maximum peak value BL at wavelength between 570 nanometer to 600 nanometers Y
Fig. 6 is the CIE 1931 chromaticity coordinate figure of the liquid crystal indicator of use present embodiment.Please refer to Fig. 4 and Fig. 6, when the backlight 110 of the frequency spectrum that uses Fig. 4, (x y) is recorded in the following table with lightness (Y) chromaticity coordinates of the shown redness of liquid crystal indicator 100, green, blueness, white.In addition, the color saturation of liquid crystal indicator (NTSC%) also is recorded in the following table.
? Rx? Ry? RY? Gx? Gy? GY? Bx? By? By? Yx? Yy? YY? Wx? Wy? WY? NTSC％?
RGBY? 0.659? 0.325? 5.21? 0.243? 0.610? 6.05? 0.131? 0.141? 6.79? 0.403? 0.529? 7.97? 0.285? 0.292? 4.56? 75.0?
As can be known from the above table, when the backlight 110 of the frequency spectrum that uses Fig. 4, the chromaticity coordinates of the white that liquid crystal indicator 100 is shown is (0.285,0.292), and is not obvious with white chromaticity coordinates (0.28, the 0.29) difference in the general tv product.In addition, when the backlight 110 of the frequency spectrum that uses Fig. 4, the color saturation of liquid crystal indicator 100 (NTSC%) can reach for 75% (as shown in Figure 6).Clearly, when the backlight 110 of the frequency spectrum that uses Fig. 4, the color saturation of liquid crystal indicator 100 obtains enhancement to a certain degree, and the chromaticity coordinates of the shown white of liquid crystal indicator 100 is very near the design requirement of tv product.
[experimental example]
Following table is different R x, R y, G x, G y, B x, B y, Y x, Y y, W that RY, GY, BY, YY corresponded to x, W y, WY and color saturation (NTSC%).Can know from following table and to learn that the chromaticity coordinates of the white that the liquid crystal indicator of the application's case is shown is all very near (0.28,0.29), and still have and be higher than 70% color saturation.
Rx? Ry? RY? Gx? Gy? GY? Bx? By? BY? Yx? Yy? YY? Wx? Wy? WY? NTSC％?
0.659? 0.325? 5.21? 0.248? 0.610? 6.05? 0.131? 0.141? 6.79? 0.403? 0.529? 7.97? 0.285? 0.292? 4.56? 71.4?
0.664? 0.325? 5.21? 0.253? 0.610? 6.05? 0.136? 0.141? 6.79? 0.403? 0.529? 7.97? 0.289? 0.292? 8.67? 71.4?
0.654? 0.325? 5.21? 0.244? 0.610? 6.05? 0.127? 0.141? 6.79? 0.398? 0.529? 7.97? 0.281? 0.292? 8.67? 71.3?
0.659? 0.330? 5.21? 0.248? 0.615? 6.05? 0.131? 0.145? 6.79? 0.403? 0.534? 7.97? 0.286? 0.298? 8.67? 71.6?
0.659? 0.320? 5.21? 0.248? 0.605? 6.05? 0.131? 0.136? 6.79? 0.403? 0.524? 7.97? 0.283? 0.285? 8.67? 71.4?
In sum, the present invention adopts luminous frequency spectrum to have the backlight of relative maximum brightness peak between 505 nanometer to 525 nanometers and wavelength between 460 nanometer to 480 nanometers, wavelength at wavelength between 610 nanometer to 630 nanometers, and make red filter layer, green filter layer, blue color filter layer, Yellow filter layer under this backlight, present specific chromaticity coordinates and lightness, so that the shown white chromaticity coordinates of liquid crystal indicator is more near (0.28,0.29).
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of claim of the present invention.

Claims (7)

1. a liquid crystal indicator is characterized in that, comprising:
One backlight, the luminous frequency spectrum of this backlight has the relative maximum brightness peak between 505 nanometer to 525 nanometers and wavelength between 460 nanometer to 480 nanometers, wavelength at wavelength between 610 nanometer to 630 nanometers; And
One display panels, be disposed at this backlight top, this display panels has a red filter layer, a green filter layer, a blue color filter layer and a Yellow filter layer, and this red filter layer, this green filter layer, this blue color filter layer, this Yellow filter layer satisfy following condition:
Under this backlight, the x coordinate of this red filter layer on CIE 1931 chromaticity coordinates is R x, the y coordinate is R y, lightness is RY, wherein R x〉=0.654, R y≤ 0.330;
Under this backlight, the x coordinate of this green filter layer on CIE 1931 chromaticity coordinates is G x, the y coordinate is G y, lightness is GY, wherein G x≤ 0.253, G y〉=0.605, and 0.83≤RY/GY≤0.87;
Under this backlight, the x coordinate of this blue color filter layer on CIE 1931 chromaticity coordinates is B x, the y coordinate is B y, lightness is BY, wherein B x≤ 0.136, B y≤ 0.146, and 0.86≤GY/BY≤0.92; And
Under this backlight, the x coordinate of this Yellow filter layer on CIE 1931 chromaticity coordinates is Y x, the y coordinate is Y y, lightness is YY, wherein Y x≤ 0.408, Y y≤ 0.534, and 0.83≤BY/YY≤0.87, and 1.5≤YY/RY≤1.55.
2. liquid crystal indicator according to claim 1 is characterized in that, this backlight is an organic electroluminescent element.
3. liquid crystal indicator according to claim 1, it is characterized in that, this backlight has relative maximum brightness peak BL1 at wavelength between 460 nanometer to 480 nanometers, this backlight has relative maximum brightness peak BL2 at wavelength between 525 nanometer to 525 nanometers, this backlight has relative maximum brightness peak BL3 at wavelength between 610 nanometer to 630 nanometers, and BL1: BL2: BL3=0.97: 0.99: 0.77.
4. liquid crystal indicator according to claim 1, it is characterized in that, this backlight is about 470 nanometers at wavelength and has relative maximum brightness peak BL1, this backlight is about 515 nanometers at wavelength and has relative maximum brightness peak BL2, this backlight is about 620 nanometers at wavelength and has relative maximum brightness peak BL3, and BL1: BL2: BL3=0.97: 0.99: 0.77.
5. liquid crystal indicator according to claim 1 is characterized in that R x+ G y+ B y+ Y y〉=1.919.
6. liquid crystal indicator according to claim 5 is characterized in that R x+ G y+ B y+ Y y〉=1.939.
7. liquid crystal indicator according to claim 1 is characterized in that 0.664 〉=R x〉=0.654,0.330 〉=R y〉=0.320,0.253 〉=G x〉=0.243,0.615 〉=G y〉=0.605,0.136 〉=B x〉=0.126,0.146 〉=B y〉=0.136,0.408 〉=Y x〉=0.398,0.534 〉=Y y〉=0.524.
CN2010102999267A 2010-09-28 2010-09-28 Liquid crystal display (LCD) device Pending CN101984373A (en)

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