CN101441351A - LCD device - Google Patents
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- CN101441351A CN101441351A CNA2008101850328A CN200810185032A CN101441351A CN 101441351 A CN101441351 A CN 101441351A CN A2008101850328 A CNA2008101850328 A CN A2008101850328A CN 200810185032 A CN200810185032 A CN 200810185032A CN 101441351 A CN101441351 A CN 101441351A
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Abstract
The invention provides a liquid crystal display device including a first back-light source, a second back-light source and a liquid crystal panel. The first back-light source provides carmine back light and the second back-light source provides the green back light. The first and second back-light sources are periodically alternatively drived to provide the back light display image. The liquid crystal panel includes a liquid crystal layer and a color filter. A plurality of liquid crystal molecules in the liquid crystal layer are controlled for adjusting the penetration of the back light generated by the first and second back-light sources. The color filter includes a plurality of red pixel area, a plurality of transparent pixel area and a plurality of green pixel area for performing the colorful filtering treatment for the back light penetrating the liquid crystal layer.
Description
Technical field
The present invention relates in particular to the LCD of the wide colour gamut of a kind of tool relevant for a kind of LCD.
Background technology
LCD (Liquid Crystal Display; LCD) be present widely used a kind of flat-panel screens, it has, and external form is frivolous, power saving and advantage such as radiationless.Generally speaking, LCD comprises colored filter, liquid crystal layer and backlight.Yet, restriction because of the optical characteristics of colored filter and liquid crystal layer, make LCD can't present the realistic colour of original image fully, in other words, high color rendition (color reproduction) is the important efficiency characteristic of advanced LCD.
Fig. 1 is the synoptic diagram of known LCD.As shown in Figure 1, LCD 100 comprises colored filter 110, liquid crystal layer 120, thin film transistor (TFT) array unit 130, diffuser plate (Diffuser) 140 and backlight 150.Colored filter 110 comprises a plurality of red pixels district 101, a plurality of green pixels district 102 and a plurality of blue pixel district 103 that periodically is provided with.LCD 100 operates to write a plurality of data-signals to a plurality of pixel cells according to the circuit of a plurality of signal control TFT array elements 130, change the ordered state of the liquid crystal molecule in the liquid crystal layer 120 in order to the voltage difference at each pixel region two ends of changing liquid crystal layer 120, and then change the penetrance of each pixel region of liquid crystal layer 120, cooperate even backlight that diffuser plates 140 are provided by backlight 150 again with display image.
Though utilize colored filter 110 and backlight 150 with high color rendering, the colour gamut (Color Gamut) that LCD 100 is presented is NTSC (National Television StandardsCommittee, NTSC) colour gamut more than 100%, but the output brightness meeting of LCD 100 therefore plant high color rendering colored filter 110 the low penetration rate and significantly reduce, so just more the backlight 150 of high brightness so can cause high backlight power consumption to keep brightness of image.
Summary of the invention
According to embodiments of the invention, it discloses the LCD of the wide colour gamut of a kind of tool, and it comprises first backlight, second backlight and liquid crystal panel.The frequency spectrum backlight of first backlight mainly comprises the first brightness peak wavelength and the second brightness peak wavelength.The first brightness peak wavelength is between about 400nm and about 480nm, and the second brightness peak wavelength is between about 600nm and about 700nm.The frequency spectrum backlight of second backlight mainly comprises the 3rd brightness peak wavelength between about 500nm and about 580nm.Liquid crystal panel comprises liquid crystal layer and colored filter.Liquid crystal layer has that a plurality of liquid crystal molecules are controlled to adjust first backlight and second backlight provides penetrance backlight.Colored filter is in order to handle the colorized optical filtering that carries out backlight that penetrates liquid crystal layer.
According to embodiments of the invention, it discloses the LCD of the wide colour gamut of a kind of tool in addition, and it comprises first backlight, second backlight and colored filter.The frequency spectrum backlight of first backlight mainly comprises the first brightness peak wavelength and the second brightness peak wavelength.The first brightness peak wavelength is between about 400nm and about 480nm, and the second brightness peak wavelength is between about 600nm and about 700nm.The frequency spectrum backlight of second backlight mainly comprises the 3rd brightness peak wavelength between about 500nm and about 580nm.Colored filter has a plurality of pixel regions, and in order to provide the colorized optical filtering that carries out backlight to handle to first backlight and second backlight, wherein a plurality of pixel regions comprise at least one transparent pixels district.
The LCD that embodiments of the invention provide cooperates the colored filter in tool red pixel district, transparent pixels district and blue pixel district by periodically alternately providing carmetta backlight and green colored backlights, to realize the image output of wide colour gamut.In addition, because 1/3rd zones are contained in the transparent pixels district of colored filter in fact, so can significantly improve average penetration rate backlight.For identical backlight intensity, exportable tool is the image of high brightness more, or for identical image output brightness, can reduce backlight intensity that backlight provides to save backlight power consumption.
Description of drawings
Fig. 1 is the synoptic diagram of known LCD.
Fig. 2 is the preferred embodiment synoptic diagram of LCD of the present invention.
Fig. 3 is that the colored filter of Fig. 2 is carried out carmetta optical filtering processing synoptic diagram backlight.
Fig. 4 is the optical filtering processing synoptic diagram that the colored filter of Fig. 2 is carried out green colored backlights.
Fig. 5 handles the relevant frequency spectrum synoptic diagram for first carmetta that embodiment the provides optical filtering backlight that the colored filter of Fig. 2 is carried out first backlight.
Fig. 6 carries out the optical filtering of first green colored backlights that embodiment provides of second backlight and handles the relevant frequency spectrum synoptic diagram for the colored filter of Fig. 2.
Fig. 7 is presented among the CIE1931 chromaticity coordinates figure, according to the colour gamut of the preferred embodiment of the present invention that data present of Fig. 9.
Fig. 8 is the running synoptic diagram of the LCD of Fig. 2, and wherein transverse axis is a time shaft.
Fig. 9 for first embodiment by first embodiment of first backlight of LCD of the present invention and second backlight produced backlight, after the optical filtering processing of colored filter, penetrate light, in chromaticity coordinates (x, y) data of CIE1931 chromaticity coordinates figure.
Figure 10 for first embodiment by first embodiment of first backlight of LCD of the present invention and second backlight produced backlight, after the optical filtering processing of colored filter, penetrate light, in chromaticity coordinates (u ＇, the v ＇) data of CIE1976 chromaticity coordinates figure.
Drawing reference numeral
100,200 LCD
101,201 red pixel districts
102 green pixel districts
103,203 blue pixel districts
110,210 colored filters
120,220 liquid crystal layers
130,230 thin film transistor (TFT) array unit
140,240 diffuser plates
150 backlights
202 transparent pixels districts
251 first backlights
253 first drivers
261 second backlights
263 second drivers
280 liquid crystal panels
290 backlight modules
510 carmetta frequency spectrum backlight
The optical filtering frequency spectrum in 520 red pixel districts
The optical filtering frequency spectrum in 530 transparent pixels districts
The optical filtering frequency spectrum in 540 blue pixel districts
550 penetrate the ruddiness frequency spectrum of light (R)
560 penetrate the fuchsin optical spectrum of light (M)
570 penetrate the blue light frequency spectrum of light (B)
610 green colored backlights frequency spectrums
650 penetrate the gold-tinted frequency spectrum of light (Y)
660 penetrate the green glow frequency spectrum of light (G)
670 penetrate the dark green optical spectrum of light (C)
710,720 colour gamuts
Sd1 first drive signal
Sd2 second drive signal
The Tp lead time
Embodiment
For making the present invention more apparent and understandable, hereinafter, cooperate appended accompanying drawing to elaborate, but the embodiment that is provided not is the scope that contains in order to restriction the present invention especially exemplified by embodiment according to LCD of the present invention.
Fig. 2 is the preferred embodiment synoptic diagram of LCD of the present invention.As shown in Figure 2, LCD 200 comprises liquid crystal panel 280 and backlight module 290.Liquid crystal panel 280 comprises colored filter 210, liquid crystal layer 220 and thin film transistor (TFT) array unit 230.Backlight module 290 comprises diffuser plate 240, first backlight 251, first driver 253, second backlight 261 and second driver 263.LCD 200 operates to write a plurality of data-signals to a plurality of pixel cells according to the circuit of a plurality of signal control TFT array elements 230, change the ordered state of the liquid crystal molecule in the liquid crystal layer 220 in order to the voltage difference at each pixel region two ends of changing liquid crystal layer 220, and then change the penetrance of each pixel region of liquid crystal layer 220, cooperate even backlight that diffuser plate 240 provided with second backlight 261 by first backlight 251 again with display image.First driver 253 is used to provide the first drive signal Sd1 and is used to provide the second drive signal Sd2 to drive second backlight 261 to drive first backlight, 251, the second drivers 263.
The frequency spectrum backlight of first backlight 251 mainly comprises the first brightness peak wavelength and the second brightness peak wavelength.The first brightness peak wavelength is between about 400nm and about 480nm.The second brightness peak wavelength is between about 600nm and about 700nm.Just, first backlight 251 is in order to provide fuchsin light (Magenta Light).In first embodiment of first backlight 251, first backlight 251 comprise coating red fluorescent powder layer (Phosphor Powder Layer) blue LED (Light EmittingDiode, LED).In second embodiment of first backlight 251, first backlight 251 comprises blue-light-emitting source and emitting red light source, wherein the blue-light-emitting source can be blue LED or blue Organic Light Emitting Diode (Organic Light Emitting Diode, OLED), the emitting red light source can be red light emitting diodes or red Organic Light Emitting Diode.In the 3rd embodiment of first backlight 251, first backlight 251 comprise the cold cathode fluorescent lamp that scribbles blue-fluorescence bisque and red fluorescent powder layer (Cold-CathodeFluorescent Lamp, CCFL).In the 4th embodiment of first backlight 251, first backlight 251 comprise the external electrode fluorescent tube that scribbles blue-fluorescence bisque and red fluorescent powder layer (External ElectrodeFluorescent Lamp, EEFL).
The frequency spectrum backlight of second backlight 261 mainly comprises the brightness peak wavelength between about 500nm and about 580nm.Just, second backlight 261 is the green emitting source.In first embodiment of second backlight 261, second backlight 261 comprises green LED.In second embodiment of second backlight 261, second backlight 261 comprises green organic light emitting diode (LED).In the 3rd embodiment of second backlight 261, second backlight 261 comprises the cold cathode fluorescent lamp that scribbles the green fluorescent bisque.In the 4th embodiment of second backlight 261, second backlight 261 comprises the external electrode fluorescent tube that scribbles the green fluorescent bisque.
Fig. 3 is that the colored filter of Fig. 2 is carried out carmetta optical filtering processing synoptic diagram backlight.As shown in Figure 3, red pixel district 201 carries out to filter and handles so that the carmetta redness that is converted to backlight is penetrated light (R); After transparent pixels district 202 carried out carmetta optical filtering processing backlight, the output carmetta penetrated light (M); Blue pixel district 203 carries out to filter and handles so that the carmetta blueness that is converted to backlight is penetrated light (B).Fig. 4 is the optical filtering processing synoptic diagram that the colored filter of Fig. 2 is carried out green colored backlights.As shown in Figure 4, red pixel district 201 carries out to filter to handle and penetrates light (Y) green colored backlights is converted to yellow; After transparent pixels district 202 carried out the optical filtering processing of green colored backlights, the output green penetrated light (G); Blue pixel district 203 carries out to filter to handle and penetrates light (C) green colored backlights is converted to dark green (Cyan).
Fig. 5 handles the relevant frequency spectrum synoptic diagram for first carmetta that embodiment the provides optical filtering backlight that colored filter 210 is carried out first backlight 251.As shown in Figure 5, the carmetta of the light source that blue LED provides of coating red fluorescent powder layer frequency spectrum 510 backlight comprises between first brightness peak between 400nm and the 480nm and second brightness peak between 600nm and 700nm.The optical filtering frequency spectrum 520 in red pixel district 201 is shown in optical wavelength and has high penetration greater than about 600nm backlight.The optical filtering frequency spectrum 530 display light wavelength in transparent pixels district 202 are at the backlight equal tool high penetration of visible frequency band 380nm～780nm.The optical filtering frequency spectrum 540 in blue pixel district 203 is shown in optical wavelength and has high penetration at about 400nm to about 480nm backlight.
After the carmetta that first backlight 251 the is provided optical filtering through red pixel district 201 backlight was handled, what be converted to tool ruddiness frequency spectrum 550 penetrated light (R).After the carmetta that first backlight 251 the is provided optical filtering through transparent pixels district 202 backlight is handled, almost still keep carmetta frequency spectrum 510 backlight and output device fuchsin optical spectrum 560 penetrate light (M).After the carmetta that first backlight 251 the is provided optical filtering through blue pixel district 203 backlight was handled, what be converted to tool blue light frequency spectrum 570 penetrated light (B).
Fig. 6 handles the relevant frequency spectrum synoptic diagram for the optical filtering that colored filter 210 is carried out first green colored backlights that embodiment provides of second backlight 261.As shown in Figure 6, the green colored backlights frequency spectrum 610 of light source that green LED provides comprises the brightness peak between 500nm and 580nm.In like manner, the green colored backlights that second backlight 261 is provided is after the optical filtering in red pixel district 201 is handled, and what be converted to tool gold-tinted frequency spectrum 650 penetrates light (Y).The green colored backlights that second backlight 261 is provided is almost still kept green colored backlights frequency spectrum 610 and output produces tool green glow frequency spectrum 660 penetrates light (G) after the optical filtering in transparent pixels district 202 is handled.The green colored backlights that second backlight 261 is provided is after the optical filtering in blue pixel district 203 is handled, and what be converted to the dark green optical spectrum 670 of tool penetrates light (C).
Fig. 9 is backlight for what produced by first embodiment of first backlight 251 and second backlight 261, penetrates light after the optical filtering processing of colored filter 210, in chromaticity coordinates (x, y) data of CIE1931 chromaticity coordinates figure.As shown in Figure 9, chromaticity coordinates corresponding to ruddiness frequency spectrum 550 is R (0.637,0.322), be Y (0.393,0.570) corresponding to the chromaticity coordinates of gold-tinted frequency spectrum 650, chromaticity coordinates corresponding to green glow frequency spectrum 660 is G (0.185,0.744), be C (0.064,0.711) corresponding to the chromaticity coordinates of dark green optical spectrum 670, chromaticity coordinates corresponding to blue light frequency spectrum 570 is B (0.149,0.029).
Fig. 7 is presented among the CIE1931 chromaticity coordinates figure, according to the colour gamut of the data preferred embodiment of the present invention that data present of Fig. 9.In Fig. 7, the NTSC colour gamut that colour gamut 710 is formulated for NTSC, colour gamut 720 is the colour gamut of chromaticity coordinates R, Y, G, C and the preferred embodiment of the present invention that B presents of Fig. 9.As shown in Figure 7, the colour gamut 720 of preferred embodiment of the present invention is about 140% of NTSC colour gamut 710.
Figure 10 is backlight for what produced by first embodiment of first backlight 251 and second backlight 261, penetrates light after the optical filtering processing of colored filter 210, in chromaticity coordinates (u ＇, the v ＇) data of CIE1976 chromaticity coordinates figure.As shown in figure 10, chromaticity coordinates corresponding to ruddiness frequency spectrum 550 is R (0.473,0.527), be Y (0.174,0.567) corresponding to the chromaticity coordinates of gold-tinted frequency spectrum 650, chromaticity coordinates corresponding to green glow frequency spectrum 660 is G (0.064,0.579), be C (0.023,0.561) corresponding to the chromaticity coordinates of dark green optical spectrum 670, chromaticity coordinates corresponding to blue light frequency spectrum 570 is B (0.204,0.076).Chromaticity coordinates R, Y, G, C and the B of Figure 10 presents the colour gamut of preferred embodiment of the present invention in CIE1976 chromaticity coordinates figure, be about CIE1976 chromaticity coordinates figure corresponding NTSC colour gamut 150%.
Fig. 8 is the running synoptic diagram of the LCD of Fig. 2, and wherein transverse axis is a time shaft.In Fig. 8, show the gray scale voltage of red pixel, the gray scale voltage of transparent pixels, gray scale voltage, the first drive signal Sd1 and the second drive signal Sd2 of blue pixel from top to bottom respectively.As shown in Figure 8, in each image time, all postpone earlier a lead time Tp, wait gray scale voltage to enter stable state after, the first drive signal Sd1 or the second drive signal Sd2 just are enabled to drive first backlight 251 or second backlight 261.Basically, first driver 253 and second driver 263 be driven first backlight 251 and second backlight 261 periodically, in order to periodically alternately to provide carmetta backlight and green colored backlights.
For example, in the I image time, the gray scale voltage of the gray scale voltage of red pixel, the gray scale voltage of transparent pixels and blue pixel is through lead time Tp and after entering stable state, first driver 253 is that the first drive signal Sd1 of output enable provides carmetta backlight to drive first backlight 251, carmetta backlight after red pixel district 201 filters output red penetrate light (R), the carmetta back output carmetta that filters through transparent pixels district 202 backlight penetrates light (M), carmetta backlight after 203 optical filterings of blue pixel district output blue penetrate light (B).In (I+1) image time, the gray scale voltage of the gray scale voltage of red pixel, the gray scale voltage of transparent pixels and blue pixel is through lead time Tp and after entering stable state, second driver 263 is that the second drive signal Sd2 of output enable provides green colored backlights to drive second backlight 261, green colored backlights output yellow after red pixel district 201 filters penetrates light (Y), green colored backlights output green after transparent pixels district 202 filters penetrates light (G), and green colored backlights is the dark green light (C) that penetrates of output after blue pixel district 203 filters.(I+2) image time in and (I+3) image time in, respectively repeat above-mentioned I image time in and backlight drive (I+1) image time in running thereafter.So, redness penetrates light (R), yellow and penetrates light (Y), green and penetrate light (G), dark greenly penetrate light (C) and blueness penetrates the colour gamut that light (B) can present preferred embodiment of the present invention shown in Figure 7.
In sum, LCD of the present invention cooperates the colored filter in tool red pixel district, transparent pixels district and blue pixel district by periodically alternately providing carmetta backlight and green colored backlights, to realize the image output of wide colour gamut.In addition, because 1/3rd zones are contained in the transparent pixels district of colored filter in fact, so can significantly improve average penetration rate backlight.Compared to prior art, for identical backlight intensity, exportable tool is the image of high brightness more, or for identical image output brightness, can reduce backlight intensity that backlight provides to save backlight power consumption.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; any have those skilled in the art in the invention; 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 when being as the criterion with claim institute confining spectrum.
Claims (23)
1. a LCD is characterized in that, described LCD includes:
One first backlight, its frequency spectrum backlight comprises:
One first brightness peak wavelength is between about 400nm and about 480nm; And
One second brightness peak wavelength is between about 600nm and about 700nm;
One second backlight, its frequency spectrum backlight comprises:
One the 3rd brightness peak wavelength is between about 500nm and about 580nm; And
One liquid crystal panel comprises:
One liquid crystal layer, it has, and a plurality of liquid crystal molecules are controlled to adjust described first backlight and described second backlight provides penetrance backlight; And
One colored filter is in order to handle the colorized optical filtering that carries out backlight that penetrates described liquid crystal layer.
2. LCD as claimed in claim 1 is characterized in that, described LCD comprises in addition:
One first driver is in order to drive described first backlight; And
One second driver is in order to drive described second backlight.
3. LCD as claimed in claim 2 is characterized in that, described first driver and described second drive periodic ground described first backlight of driven and described second backlight.
4. LCD as claimed in claim 1 is characterized in that, described first backlight comprises a blue LED of coating one red fluorescent powder layer.
5. LCD as claimed in claim 1 is characterized in that, described first backlight comprises a blue-light-emitting source and an emitting red light source.
6. LCD as claimed in claim 5 is characterized in that, described blue-light-emitting source is a blue LED or a blue Organic Light Emitting Diode, and described emitting red light source is a red light emitting diodes or a red Organic Light Emitting Diode.
7. LCD as claimed in claim 1 is characterized in that, described first backlight comprises a cold cathode fluorescent lamp that scribbles a blue-fluorescence bisque and a red fluorescent powder layer.
8. LCD as claimed in claim 1 is characterized in that, described first backlight comprises an external electrode fluorescent tube that scribbles a blue-fluorescence bisque and a red fluorescent powder layer.
9. LCD as claimed in claim 1 is characterized in that, described second backlight comprises a green emitting source.
10. LCD as claimed in claim 9 is characterized in that, described green emitting source is a green LED or a green organic light emitting diode (LED).
11. a LCD is characterized in that, described LCD includes:
One first backlight, its frequency spectrum backlight comprises:
One first brightness peak wavelength is between about 400nm and about 480nm; And
One second brightness peak wavelength is between about 600nm and about 700nm;
One second backlight, its frequency spectrum backlight comprises:
One the 3rd brightness peak wavelength is between about 500nm and about 580nm; And
One colored filter has a plurality of pixel regions, and in order to provide the colorized optical filtering that carries out backlight to handle to described first backlight and described second backlight, described these pixel regions comprise at least one transparent pixels district.
12. LCD as claimed in claim 11 is characterized in that, described colored filter comprises a plurality of red pixels district, a plurality of transparent pixels district and a plurality of blue pixel district.
13. LCD as claimed in claim 12 is characterized in that, a plurality of red pixels district of two adjacent column of described colored filter, a plurality of transparent pixels district and a plurality of blue pixel district are according to identical series arrangement.
14. LCD as claimed in claim 12 is characterized in that, a plurality of red pixels district of two adjacent column of described colored filter, a plurality of transparent pixels district and a plurality of blue pixel district are according to different series arrangement.
15. LCD as claimed in claim 11 is characterized in that, described first backlight comprises a blue LED of coating one red fluorescent powder layer.
16. LCD as claimed in claim 11 is characterized in that, described first backlight comprises a blue-light-emitting source and an emitting red light source.
17. LCD as claimed in claim 16 is characterized in that, described blue-light-emitting source is a blue LED or a blue Organic Light Emitting Diode, and described emitting red light source is a red light emitting diodes or a red Organic Light Emitting Diode.
18. LCD as claimed in claim 11 is characterized in that, described first backlight comprises a cold cathode fluorescent lamp that scribbles a blue-fluorescence bisque and a red fluorescent powder layer.
19. LCD as claimed in claim 11 is characterized in that, described first backlight comprises an external electrode fluorescent tube that scribbles a blue-fluorescence bisque and a red fluorescent powder layer.
20. LCD as claimed in claim 11 is characterized in that, described second backlight comprises a green emitting source.
21. LCD as claimed in claim 20 is characterized in that, described green emitting source is a green LED or a green organic light emitting diode (LED).
22. LCD as claimed in claim 11 is characterized in that, described LCD comprises in addition:
One first driver is in order to drive described first backlight; And
One second driver is in order to drive described second backlight.
23. LCD as claimed in claim 22 is characterized in that, described first driver and described second drive periodic ground described first backlight of driven and described second backlight.
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| CN2008101850328A CN101441351B (en) | 2008-12-26 | 2008-12-26 | LCD device |
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| CN2008101850328A CN101441351B (en) | 2008-12-26 | 2008-12-26 | LCD device |
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| CN101441351A true CN101441351A (en) | 2009-05-27 |
| CN101441351B CN101441351B (en) | 2011-04-13 |
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| CN112162432A (en) * | 2020-06-09 | 2021-01-01 | 友达光电股份有限公司 | Display device and display method thereof |
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