CN100416368C - High colour purity CSTN liquid crystal display and method of implementing high colour purity - Google Patents
High colour purity CSTN liquid crystal display and method of implementing high colour purity Download PDFInfo
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- CN100416368C CN100416368C CNB2005100218638A CN200510021863A CN100416368C CN 100416368 C CN100416368 C CN 100416368C CN B2005100218638 A CNB2005100218638 A CN B2005100218638A CN 200510021863 A CN200510021863 A CN 200510021863A CN 100416368 C CN100416368 C CN 100416368C
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Abstract
The invention discloses high chromaticity CSTN liquid crystal display. It includes the first and second transparent base plate, liquid crystal, color screen, fluctuation polaroid, and back light source. The chromaticity NTSC ratio of the color screen is not less than 60%. The light wave of the back light source has two main luminescence wave length crests which one is in the blue light wavelength range; another is in middle light wavelength range between the red light and green light. The invention realize that when the light emitted from the back light source pass through red, green, and blue pixels, the light with the pixel wavelength is almost fully pass through; while other is almost fully absorbed. Thus it can reach each pixel light colorimetric purity maximum, make the NTSC ratio of the CSTN liquid crystal display be bigger than 45%.
Description
[technical field]
The present invention relates to a kind of CSTN (coler Super Twisted Nematic, be the colorful ultra-twist nematic phase) LCD, particularly relate to and can realize NTSC (NTSC's standard) than the CSTN LCD greater than 45% high chroma, the color rendering scope can compare favourably with TFT.
[background technology]
In order to attract the consumer, increasing mobile phone manufacturer begins to make colour screen handset, and the mobile phone color screen of usefulness is TFT LCD or CSTN LCD usually.TFT dichroic liquid crystal display and CSTN LCD respectively have relative merits.The TFT colour liquid crystal display device is well received by consumers with its outstanding image quality and response speed, but expensive price and huge power consumption also make many consumers hang back.Though CSTN LCD image quality and response speed are poorer than the TFT LCD, it is cheap, power consumption is less, if improve the image quality of CSTN LCD, will make the CSTN LCD become the very strong competitor of TFT LCD.
The image quality of LCD depends primarily on colourity (being saturation degree), brightness, contrast and the resolution of color, wherein the color of the light launched by the red, green, blue pixel of the color rendering scope of colour liquid crystal display device decides, each pixel is respectively (XR at the chroma point of CIE-XYZ colorimetric system, YR), (XG, YG), (XB, YB) time, the leg-of-mutton cartographic represenation of area that the color rendering scope surrounds with these three points on the x-y chromatic diagram.That is to say that this leg-of-mutton area is big more, can reproduce distinct colour element more.Normally with the three primary colors-red (0.67 of NTSC (NTSC) specified standard form, 0.33), green (0.21,0.71) and blue (0.14,0.08) 3 formed triangles are the basis, to represent described leg-of-mutton area than (% of unit is designated hereinafter simply as " NTSC ratio ") with respect to this leg-of-mutton area.The NTSC of TFT LCD is higher than 45% than generally, and the colourity NTSC ratio of CSTN LCD is about 30% usually, and image quality is more far short of what is expected than TFT LCD.Through research, with backlight (Backlight), liquid crystal (Liquid Crystal) and polaroid (Polarizer) and their matching structure, promptly the face look of the light that sends from LCD is compared by the NTSC of emission wavelength backlight, three kinds of pixels of colored filter red, green, blue and the retardation and the offset of the optical system that liquid crystal and polaroid are formed are determined the colourity NTSC that finds LCD than the colored filter that is decided by to have three kinds of pixels of red, green, blue (Color Filter), transillumination.Experiment showed, under the identical situation of other condition that if the colourity NTSC of the used colored filter of CSTN LCD is big than more, the NTSC of the shown face look of this CSTN LCD is than just big more so through a large amount of production.But in order to improve the NTSC ratio of colored filter, again following problem can appear: the NTSC ratio that 1) improves colored filter, the color saturation that is colored filter is higher, just need to increase thickness, this just needs a large amount of pigment, because the original just not sharp-pointed characteristic of the curve of spectrum of pigment, increase pigment, being equivalent to also can increase the absorption of main light emission portion, thereby the transmitance of main light emission portion is reduced, and causes pixel to shade on the whole.2) concentration that increases pigment in each pixel of colored filter causes the performance of photoetching material to descend, for example cause development time elongated, to the control of the pattern form problem that difficulty and quality descend that becomes.3) owing to increase the thickness of colored filter, be easy to generate the situation of the manufacturing process that is not suitable for LCD, and then increased the manufacturing cost of LCD.4) even adopt NTSC,, still can not obtain NTSC than higher CSTN LCD if do not have backlight, liquid crystal and the polaroid of coupling than high colored filter.For example adopt NTSC than greater than 65% colored filter, if there not be the backlight of coupling, the NTSC of CSTN LCD can reach 40% than the highest, still not as good as the TFT LCD.
[summary of the invention]
Fundamental purpose of the present invention is exactly in order to solve prior art problems, and a kind of CSTN LCD of high chroma and the method for realization high chroma thereof are provided, and improves the NTSC ratio of CSTN LCD, thereby improves the image quality of CSTN LCD.
Secondary objective of the present invention is exactly in order to solve prior art problems, and a kind of CSTN LCD of high chroma and the method for realization high chroma thereof are provided, and the NTSC that makes the CSTN LCD can match in excellence or beauty it with the TFT LCD than greater than 45%.
For achieving the above object, the CSTN LCD of a kind of high chroma that the present invention proposes, comprise first transparency carrier, second transparency carrier of facing with first transparency carrier, be sealed in the liquid crystal between first transparency carrier and second transparency carrier, colored filter, polaroid and backlight up and down, described colored filter is attached to the medial surface of first transparency carrier or second transparency carrier, described upper polarizer is attached to the lateral surface of first transparency carrier, described polaroid down is attached to the lateral surface of second transparency carrier, described backlight is positioned at the lateral surface of polaroid down, the colourity NTSC ratio of described colored filter is more than or equal to 60%, have two main light emission wavelength peaks in the light wave that described backlight sends, and the first main light emission wavelength peak position is in the blue light wavelength scope, in the light wavelength scope of the second main light emission wavelength peak position between ruddiness and green glow.
Preferably, the colourity NTSC of described colored filter ratio is 65%.The second main light emission wavelength peak position is the gold-tinted zone of 530nm～610nm in wavelength coverage.
Further improvement of the present invention is: the determined retardation of the composition proportion of described liquid crystal and up and down the offset of polaroid make the first main light emission wavelength peak of backlight at the wavelength place of the blue pixel of colored filter, the second main light emission wavelength peak is in the red pixel wavelength of colored filter and the central wavelength of green pixel wavelength.
For achieving the above object, the CSTN LCD of the present invention's proposition realizes that the method for high chroma may further comprise the steps:
The colourity NTSC ratio that makes colored filter is more than or equal to 60%;
Have two main light emission wavelength peaks in the light wave that backlight is sent, and the first main light emission wavelength peak position is in the blue light wavelength scope, in the light wavelength scope of the second main light emission wavelength peak position between ruddiness and green glow.
Preferably, the colourity NTSC of described colored filter ratio is 65%.The second main light emission wavelength peak position is the gold-tinted zone between the red-green glow of 530nm～610nm in wavelength coverage.
Further improvement of the present invention is: also comprise optical wavelength peak match regulating step, described optical wavelength peak match regulating step comprise the retardation of regulating liquid crystal and up and down the offset of polaroid make the first main light emission wavelength peak of backlight at the wavelength place of the blue pixel of colored filter, the second main light emission wavelength peak is in the red pixel wavelength of colored filter and the central wavelength of green pixel wavelength.
The white light that sends backlight is made up of red, orange, yellow, green, blue, blue, purple, and have only three kinds of colors of red, green, blue on the colored filter usually, when the white light that sends backlight passes through three kinds of pixels of red, green, blue of colored filter respectively, have only ruddiness, green glow, blue light to pass through respectively, other light is absorbed fully.Realize redness, green, the blue demonstration of high color purity, then require the purity of ruddiness composition, green glow composition and blue light ingredient of the light that sends backlight the highest, have two main light emission wavelength peaks in the light wave that sends backlight of the present invention, realize that backlight to have two main light emission wavelength peaks be mature technology, one at two main light emission wavelength peaks of backlight of the present invention are at blue region, can realize that the purity of blue light ingredient is the highest by the blue pixel of colored filter.And in another light wavelength scope between redness and green light, arrange the gold-tinted that the only orange or yellow between ruddiness and the green glow, the light among the present invention between ruddiness and the green glow preferably intersect with the wavelength coverage of ruddiness and green glow according to wavelength of visible light.Gold-tinted can resolve into ruddiness and green glow, respectively by the red pixel and the green pixel of colored filter, can realize that then the purity of ruddiness composition and green glow composition is high as far as possible.The colourity of colored filter is good more simultaneously, the attainable chromaticity range of CSTN LCD is just big more, but improve the NTSC ratio of colored filter, just need to increase thickness, the experiment proved that, the NTSC ratio is 65% to be that colored filter is not change attainable maximum color saturation under the ink thickness situation, improves color saturation again and just need correspondingly increase certain thickness.So adopting the NTSC ratio is 65% to be that colored filter both can not increase thickness, the adjusting at the luminous predominant wavelength peak by backlight can improve the NTSC ratio of CSTN LCD again.By the retardation of adjusting liquid crystal and the offset of polaroid, can make the first main light emission wavelength peak of backlight at the wavelength place of the blue pixel of colored filter, the second main light emission wavelength peak is in the red pixel wavelength of colored filter and the central wavelength of green pixel wavelength, in this case, the NTSC ratio of CSTN LCD can reach 45%, compare quite with the NTSC of TFT LCD, improved the image quality of CSTN LCD greatly.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is a kind of structural drawing of CSTN LCD;
Fig. 2 is the branch distribution curve flux of the colored filter of a kind of embodiment of the present invention;
Fig. 3 is the wavelength luminosity curve figure of the backlight of a kind of embodiment of the present invention;
Fig. 4 is the synoptic diagram that the colored filter of a kind of embodiment of the present invention divides light curve and backlight luminosity curve coupling.
[embodiment]
Specific embodiment one, as shown in Figure 1, the CSTN LCD comprises following structure by surround lighting to backlight usually successively: upper polarizer 1, first transparency carrier 2, transparency electrode 3, liquid crystal 4, transparency electrode 5, colored filter 6, second transparency carrier 7, polaroid 8 and backlight 9 down.First transparency carrier 2 and second transparency carrier 7 adopt transparent glass substrate usually, are pasted with upper polarizer 1 and following polaroid 8 respectively in its outside.Transparency electrode is the ITO electrode normally.
When the wavelength of the red, green, blue pixel of colored filter just in time with two wavelength peak matches of backlight, a wavelength peak is at the blue pixel wavelength of colored filter place, another wavelength peak position is in the central wavelength of red pixel wavelength of colored filter and green pixel wavelength, as shown in Figure 4, the composition maximum that sees through of ruddiness, green glow and blue light in this case, the excitation that just can realize redgreenblue is best, and the excitation of whole C stn liquid crystal display is best.
Specific embodiment two, different with specific embodiment one be the optical system (Optical System) that the present embodiment design has liquid crystal (LiquidCrystal) and polaroid (Polarizer) composition, above-mentioned colored filter (Color Filter) and backlight (Backlight) are complementary, realize that the excitation of light of each pixel is the highest.
Birefringent phenomenon can take place during by liquid crystal in light, the light of different wave length by the time can produce certain retardation, by regulating the composition proportion of liquid crystal, can change retardation.Be attached with compensate film on the polaroid up and down.By the retardation of adjusting liquid crystal and the offset of polaroid compensate film, the light that sends backlight is changed at each wavelength, be equivalent to make emission wavelength peak curve backlight to produce slight moving, to regulate the wavelength of emission wavelength peak-to-peak value correspondence, the wavelength corresponding with three kinds of pixels of red, green, blue of colored filter is the most approaching, as shown in Figure 4, can realize ruddiness, green glow, the blue light of high color purity.Retardation and offset will be decided on the wavelength of three kinds of pixel correspondences of colored filter and emission wavelength peak curve backlight, empirical value examination by the long-term production gained is irritated, the liquid crystal retardation amount is between 800-860nm, the polaroid offset is 430nm up and down, regulate the polaroid angle and reach optimal display result, add that backlight makes module, measure full frame redness with YC tester BM-7 or Other Instruments then, green, the chromaticity coordinate value of blue picture, corresponding triangle draws in the cie color coordinate axis, three primary colors-red (0.67 with NTSC (NTSC) specified standard form, 0.33), green (0.21,0.71) and blue (0.14,0.08) 3 formed standard triangles compare.If leg-of-mutton shape is on one side blue with respect to standard gable deflection, then need suitably reduce the retardation of liquid crystal or the offset of increase polaroid; On one side red as the fruit part deflection, as then to need suitably to increase the retardation of liquid crystal or reduce polaroid offset, similar to realize leg-of-mutton shape to the standard triangle, reach maximum area.Thereby the optical system that the compensate film that makes the retardation of liquid crystal and polaroid is formed makes the red of colored filter, green, the wavelength of blue pixel just in time reaches the coupling of the best with two predominant wavelength peaks of backlight, a wavelength peak is at the blue pixel wavelength of colored filter place, another wavelength peak position is in the central wavelength of red pixel wavelength of colored filter and green pixel wavelength, realize that the light that backlight sends passes through red pixel respectively, when green pixel and blue pixel, the light of this pixel wavelength all almost completely by and the light of other pixel almost completely is absorbed, thereby the excitation that realizes each pixel light is the highest, compares greater than 45% with the NTSC that reaches the CSTN LCD.
Claims (9)
1. the CSTN LCD of a high chroma, comprise first transparency carrier, second transparency carrier of facing with first transparency carrier, be sealed in the liquid crystal between first transparency carrier and second transparency carrier, colored filter, polaroid and backlight up and down, described colored filter is attached to the medial surface of first transparency carrier or second transparency carrier, described upper polarizer is attached to the lateral surface of first transparency carrier, described polaroid down is attached to the lateral surface of second transparency carrier, described backlight is positioned at the lateral surface of polaroid down, it is characterized in that: the colourity NTSC ratio of described colored filter is more than or equal to 60%, have two main light emission wavelength peaks in the light wave that described backlight sends, and the first main light emission wavelength peak position is in the blue light wavelength scope, in the light wavelength scope of the second main light emission wavelength peak position between ruddiness and green glow.
2. CSTN LCD as claimed in claim 1 is characterized in that: the colourity NTSC ratio of described colored filter is 65%.
3. CSTN LCD as claimed in claim 1 or 2 is characterized in that: the described second main light emission wavelength peak position is the gold-tinted zone of 530nm～610nm in wavelength coverage.
4. CSTN LCD as claimed in claim 3 is characterized in that: the determined retardation of the composition proportion of described liquid crystal and up and down the offset of polaroid make the first main light emission wavelength peak of backlight at the wavelength place of the blue pixel of colored filter, the second main light emission wavelength peak is in the red pixel wavelength of colored filter and the central wavelength of green pixel wavelength.
5. the CSTN LCD realizes the method for high chroma, it is characterized in that may further comprise the steps:
The colourity NTSC ratio that makes colored filter is more than or equal to 60%;
Have two main light emission wavelength peaks in the light wave that backlight is sent, and the first main light emission wavelength peak position is in the blue light wavelength scope, in the light wavelength scope of the second main light emission wavelength peak position between ruddiness and green glow.
6. CSTN LCD as claimed in claim 5 realizes the method for high chroma, it is characterized in that: make the colourity NTSC ratio of colored filter equal 65%.
7. as the method for claim 5 or 6 described CSTN LCD realization high chromas, it is characterized in that: making the second main light emission wavelength peak position is the gold-tinted zone of 530nm～610nm in wavelength coverage.
8. CSTN LCD as claimed in claim 7 realizes the method for high chroma, it is characterized in that: also comprise optical wavelength peak match regulating step, described optical wavelength peak match regulating step comprise the retardation of regulating liquid crystal and up and down the offset of polaroid make the first main light emission wavelength peak of backlight at the wavelength place of the blue pixel of colored filter, the second main light emission wavelength peak is in the red pixel wavelength of colored filter and the central wavelength of green pixel wavelength.
9. CSTN LCD as claimed in claim 8 realizes the method for high chroma, it is characterized in that: the retardation of described liquid crystal is for realizing by the composition proportion of regulating liquid crystal.
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| CN102929036A (en) * | 2012-11-23 | 2013-02-13 | 亚世光电股份有限公司 | Supper twisted nematic (STN) liquid crystal display for green picture and manufacturing process thereof |
| CN108508649B (en) * | 2018-03-30 | 2021-11-26 | 上海中航光电子有限公司 | Chromaticity adjusting method of liquid crystal display device, liquid crystal display device and terminal equipment |
| CN113167953B (en) * | 2018-11-07 | 2023-10-24 | 瑞尔D斯帕克有限责任公司 | Directional display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002277870A (en) * | 2001-03-06 | 2002-09-25 | Internatl Business Mach Corp <Ibm> | Liquid crystal display and display device |
| JP2002311429A (en) * | 2001-04-11 | 2002-10-23 | Toppan Printing Co Ltd | Liquid crystal display device |
| US6765634B2 (en) * | 2001-03-06 | 2004-07-20 | International Business Machines Corporation | Liquid crystal display device and display device |
| US20040218115A1 (en) * | 2002-08-30 | 2004-11-04 | Mitsubishi Chemical Corporation | Color liquid crystal display devices |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002277870A (en) * | 2001-03-06 | 2002-09-25 | Internatl Business Mach Corp <Ibm> | Liquid crystal display and display device |
| US6765634B2 (en) * | 2001-03-06 | 2004-07-20 | International Business Machines Corporation | Liquid crystal display device and display device |
| JP2002311429A (en) * | 2001-04-11 | 2002-10-23 | Toppan Printing Co Ltd | Liquid crystal display device |
| US20040218115A1 (en) * | 2002-08-30 | 2004-11-04 | Mitsubishi Chemical Corporation | Color liquid crystal display devices |
| CN1578926A (en) * | 2002-08-30 | 2005-02-09 | 三菱化学株式会社 | Color liquid crystal display devices |
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