CN101339308B - Multiple color low-power consumption reflection-type liquid-crystal display device - Google Patents
Multiple color low-power consumption reflection-type liquid-crystal display device Download PDFInfo
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- CN101339308B CN101339308B CN2008100217944A CN200810021794A CN101339308B CN 101339308 B CN101339308 B CN 101339308B CN 2008100217944 A CN2008100217944 A CN 2008100217944A CN 200810021794 A CN200810021794 A CN 200810021794A CN 101339308 B CN101339308 B CN 101339308B
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Abstract
The invention discloses a multicolor low power reflective liquid crystal display device, which is characterized in that two liquid crystal layers are arranged by three layers of transparent substrates in a sandwich way, and comprises a first transparent substrate, a first liquid crystal layer, a second transparent substrate, a second liquid crystal layer, and a third transparent substrate, wherein, the first liquid crystal layer and the second liquid crystal layer are cholesteric liquid crystal layers which can reflect lights with different wavelengths, and the center wavelengths of the lights with different wavelengths differ no less than 50nm. The device of the invention can effectively enhance the strength of reflection, and improve display effect, meanwhile, does not need to provide power supply successively when a static picture is displayed, and effectively reduce power consumption.
Description
Technical field
The present invention relates to liquid crystal display device, a kind of reflection-type liquid-crystal display device of more specifically saying so.
Background technology
Compare with the CRT monitor part, liquid crystal display device LCD relative thin and low in energy consumption has replaced the CRT monitor part gradually in various technical fields.LCD is through years of development, formed a huge industry, be widely used in every field, twisted nematic liquid crystal shows TN-LCD, the supertwist nematic liquid crystal shows STN-LCD, and transmission-type liquid crystal display devices such as tft liquid crystal demonstration TFT-LCD occupy very big proportion.But the transmission-type liquid crystal display device power consumption is big, and the energy more than 60% all consumes on backlight, and for power consumption and the volume that reduces electronic display unit, one of the most effective way is exactly to break away from backlight, adopts reflection-type liquid-crystal display device.
Here, will use Fig. 1 to explain the reflection-type liquid-crystal display device of present routine.Fig. 1 is the surface chart of the setting that conventional reflection-type liquid-crystal display device is shown of summary.
As shown in Figure 1, the deck structure of reflection-type liquid-crystal display device is: the upper surface at liquid crystal layer 105 is followed successively by common electrode layer 104, top crown 103, colour filter 102 and phase shift films 101; Lower surface at liquid crystal layer 105 is followed successively by reflecting electrode 106, passivation layer 107, transparency electrode 108, bottom crown 109.In this reflection-type liquid-crystal display device, be to realize colored the demonstration, but surround lighting lose 2/3 light intensity at least after the process color filter by color filter, intensity of reflected light is more weak, and display effect is undesirable; Simultaneously, when reflection-type liquid-crystal display device shows tableaux, must continue to provide power supply, power consumption is bigger.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point, a kind of multiple colour low-power consumption reflection-type liquid-crystal display device being provided, in the hope of increasing intensity of reflected light, improving display effect; Need not to continue to provide power supply when showing tableaux simultaneously, effectively reduce power consumption.
Technical solution problem of the present invention adopts following technical scheme:
The design feature of multiple colour low-power consumption reflection-type liquid-crystal display device of the present invention is to be the sandwich shape by three layers of transparency carrier two-layer liquid crystal layer is set, and comprises being first transparency carrier, first liquid crystal layer, second transparency carrier, second liquid crystal layer and the 3rd transparency carrier in turn from top to bottom; First liquid crystal layer and second liquid crystal layer cholesteric crystal layer for reflecting different wavelengths of light, the center light phase of wave difference of different wavelengths of light is no less than 50nm.
The design feature of multiple colour low-power consumption reflection-type liquid-crystal display device of the present invention also is:
Bottom at the 3rd substrate is provided with visible light absorbing layer.
Antireflective film system is set above first substrate, between first substrate and the antireflective film system circular polarizing disk is set.
The catoptrical optically uniform of the optical activity of circular polarizing disk and cholesteric liquid crystal.
Between first substrate and first liquid crystal layer, and vertical orientated layer is set respectively between second liquid crystal layer and the 3rd substrate; At first liquid crystal layer and second substrate, and parallel-oriented layer is set respectively between second substrate and second liquid crystal layer.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention utilizes the characteristics of cholesteric liquid crystal to the incident light selective reflecting, adopt three layers of transparency carrier to be the structure that the sandwich shape is provided with two-layer liquid crystal layer, two-layer liquid crystal layer can reflect the light of different colors, need not color filter and can realize colored the demonstration, has improved display brightness greatly;
2, the present invention is provided with visible light absorbing layer behind the 3rd substrate, the incident light that sees through two-layer liquid crystal layer is fully absorbed, and the brightness when having reduced the dark attitude of display device improves display effect;
3, the present invention is provided with antireflective film system and circular polarizing disk before first substrate, antireflective film system has effectively reduced the reflectivity of incident light at first substrate surface, incident light plays inclined to one side formation circularly polarized light through circular polarizing disk simultaneously, light intensity have only original half, reflectivity when this all will reduce the dark attitude of display device improves the contrast of display device;
4, among the present invention because the selective reflecting of cholesteric liquid crystal has certain requirement to the optical activity of incident light, the optical activity of incident light just can be reflected in the time of must be with the catoptrical optically uniform of cholesteric liquid crystal, therefore must select the circular polarizing disk with the catoptrical optically uniform of cholesteric liquid crystal;
5, the present invention is because between first substrate and first liquid crystal layer, and between second liquid crystal layer and the 3rd substrate, be provided with vertical orientated layer respectively, oriented layer is to the vertical orientated effect of cholesteric liquid crystal, cholesteric crystal layer forms multidomain structure, has bistable behavior, need not to refresh when showing tableaux, and do not need backlight, really brought into play the advantage of the little power consumption of liquid crystal display.
Description of drawings
Fig. 1 is the prior art structural representation.
Label among Fig. 1: 101 phase shift films, 102 colour filters, 103 top crowns, 104 common electrode layer, 105 liquid crystal layers, 106 reflecting electrodes, 107 passivation layers, 108 transparency electrodes, 109 bottom crowns.
Fig. 2 is a structural representation of the present invention.
Fig. 3 is a displaying principle synoptic diagram of the present invention.
Fig. 4 a and Fig. 4 b are respectively first, second reflected light spectrogram of the present invention.
Label among Fig. 2, Fig. 3 and Fig. 4: 1 antireflective film, 2 circular polarizing disks, 3 first transparency carriers, 4 first liquid crystal layers, 5 second transparency carriers, 6 second liquid crystal layers, 7 the 3rd transparency carriers, 8 visible light absorbing layer, 9 first vertical orientated layers, 10 first planar orientation layers, 11 second planar orientation layers, 12 second vertical orientated layers, 301 external environment light, 302 transmitted lights, 303 first reflected light, the surplus light of 304 first reflections, 305 second reflected light, the surplus light of 306 second reflections.
Below by embodiment, the invention will be further described in conjunction with the accompanying drawings:
Embodiment
Referring to Fig. 2, be set to visible light absorbing layer 8 in the bottom, have three layers of transparency carrier on it, be respectively the 3rd transparency carrier 7, second transparency carrier 5 and first transparency carrier 3 from bottom to top, antireflective film is 1 to be positioned at the top layer, is circular polarizing disk 2 between the antireflective film 1 and first transparency carrier 3; Between first transparency carrier 3 and second transparency carrier 5, have first liquid crystal layer 4, between second transparency carrier 5 and the 3rd transparency carrier 7, have second liquid crystal layer 6; Be provided with respectively at the first vertical orientated layer 9 between first liquid crystal layer 4 and first transparency carrier 3, the first planar orientation layer 10 between first liquid crystal layer 4 and second transparency carrier 5, and at the second planar orientation layer 11 between second liquid crystal layer 6 and second transparency carrier 5, between second liquid crystal layer 6 and the 3rd transparency carrier 7 second vertical orientated layer 12; First liquid crystal layer 4 and second liquid crystal layer 6 are cholesteric liquid crystal.
Demonstration is generally formulated by nematic liquid crystal and chiral material with liquid crystal material of cholesteric phase, the characteristics that incident light had selective reflecting, for multiple colour low-power consumption reflection-type liquid-crystal display device, just be reflected when having only optical activity when incident light and wavelength consistent to satisfy the Bragge formula, i.e. the wavelength X of incident light with cholesteric crystal layer
0Pitch (P with liquid crystal material
0) and mean refractive index (n) be directly proportional:
λ
0=nP
0(Bragge formula)
Reflected light is a circularly polarized light, and the optically uniform of optical activity and cholesteric crystal layer, the light opposite with the cholesteric crystal layer optical activity then see through liquid crystal layer and enter down one deck, and the light that does not satisfy the Bragge formula also enters down one deck through liquid crystal layer.
The pitch P of liquid crystal material of cholesteric phase
0With chiral material concentration X
cRelation be:
Wherein HTP is the distortion power constant of chiral material, can change pitch and reflection wavelength by chirality component and the content in liquid crystal material thereof of regulating different HTP values.
Because between first substrate and first liquid crystal layer, and between second liquid crystal layer and the 3rd substrate, be provided with vertical orientated layer respectively, oriented layer is to the vertical orientated effect of cholesteric liquid crystal, cholesteric crystal layer forms multidomain structure, make cholesteric liquid crystal have bistable behavior, need not power supply is sustainable display frame, and this will further reduce the power consumption of display device.
Figure 3 shows that the displaying principle synoptic diagram of reflective LCD device of the present invention, when external environment light 301 is incident to multiple colour low-power consumption reflection-type LCD device surface, light sees through circular polarizing disk, part light is absorbed, transmitted light 302 is a circularly polarized light, optical activity is consistent with cholesteric crystal layer, transmitted light 302 arrives first liquid crystal layer 4 through first transparency carrier 3, the light that satisfies the Bragge formula is reflected out, form first reflected light 303, the surplus light 304 of first reflection arrives second liquid crystal layer 6 through second transparency carrier 5, the light that satisfies the Bragge formula is reflected out, forming the surplus light 306 of second reflected light 305, the second reflection is absorbed coating 8 after through second liquid crystal layer 6 and the 3rd transparency carrier 7 and absorbs.By regulating the intensity of first reflected light 303 and second reflected light 305, can realize multicolor displaying.
In this structure, antireflective film 1 is used for that incident light is carried out anti-reflection to be handled, and circular polarizing disk 2 is used for incident light is risen partially, the reflectivity when this all will reduce dark attitude, and this will improve the contrast of display device, improve display effect.
Fig. 4 is first, second reflected light spectrogram according to embodiment of the present invention, and Fig. 4 a is the reflected light spectrogram of first reflected light 303, and as seen from the figure, its centre wavelength is positioned at 480nm, and the reflected light bandwidth is 60nm; Fig. 5 b is the reflected light spectrogram of second reflected light 305, and as seen from the figure, its centre wavelength is positioned at 580nm, and the reflected light bandwidth is 60nm.
The present invention can application and the multiple colour low-power consumption reflection-type liquid-crystal display device of electronic chart, outdoor advertising etc.
Claims (3)
1. multiple colour low-power consumption reflection-type liquid-crystal display device, it is characterized in that being the sandwich shape by three layers of transparency carrier is provided with two-layer liquid crystal layer, comprise being first transparency carrier (3), first liquid crystal layer (4), second transparency carrier (5), second liquid crystal layer (6) and the 3rd transparency carrier (7) in turn from top to bottom; Described first liquid crystal layer (4) and second liquid crystal layer (6) are the cholesteric crystal layer that can reflect different wavelengths of light, and the centre wavelength of described different wavelengths of light differs and is no less than 50nm;
Antireflective film system (1) is set in the top of described first transparency carrier (3), between first transparency carrier (3) and the antireflective film system (1) circular polarizing disk (2) is set;
The optical activity of described circular polarizing disk (2) and the catoptrical optically uniform of cholesteric liquid crystal.
2. multiple colour low-power consumption reflection-type liquid-crystal display device according to claim 1 is characterized in that in the bottom of described the 3rd transparency carrier (7) visible light absorbing layer (8) being set.
3. multiple colour low-power consumption reflection-type liquid-crystal display device according to claim 1, it is characterized in that between described first transparency carrier (3) and first liquid crystal layer (4), and vertical orientated layer is set respectively between second liquid crystal layer (6) and the 3rd transparency carrier (7); At described first liquid crystal layer (4) and second transparency carrier (5), and parallel-oriented layer is set respectively between second transparency carrier (5) and second liquid crystal layer (6).
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| CN2008100217944A CN101339308B (en) | 2008-08-13 | 2008-08-13 | Multiple color low-power consumption reflection-type liquid-crystal display device |
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| CN2008100217944A CN101339308B (en) | 2008-08-13 | 2008-08-13 | Multiple color low-power consumption reflection-type liquid-crystal display device |
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| CN101339308B true CN101339308B (en) | 2011-03-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106527008A (en) * | 2017-01-03 | 2017-03-22 | 京东方科技集团股份有限公司 | Display device and display apparatus |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5576238B2 (en) * | 2010-10-25 | 2014-08-20 | 京セラディスプレイ株式会社 | Liquid crystal display |
| CN102566109A (en) * | 2010-12-24 | 2012-07-11 | 汕头大学 | Bistable liquid crystal grating |
| CN103353689B (en) | 2013-06-28 | 2016-03-16 | 京东方科技集团股份有限公司 | Light valve device, infrared display device, special eyeglasses and system |
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| CN1338656A (en) * | 2001-09-29 | 2002-03-06 | 赵静安 | Reflection-type cholester-phase stereo LCD |
| JP2002287136A (en) * | 2001-03-28 | 2002-10-03 | Minolta Co Ltd | Reflective liquid crystal display element |
| CN1786791A (en) * | 2004-12-09 | 2006-06-14 | 力特光电科技股份有限公司 | Light controlling film and liquid crystal display apparatus |
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Patent Citations (3)
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|---|---|---|---|---|
| JP2002287136A (en) * | 2001-03-28 | 2002-10-03 | Minolta Co Ltd | Reflective liquid crystal display element |
| CN1338656A (en) * | 2001-09-29 | 2002-03-06 | 赵静安 | Reflection-type cholester-phase stereo LCD |
| CN1786791A (en) * | 2004-12-09 | 2006-06-14 | 力特光电科技股份有限公司 | Light controlling film and liquid crystal display apparatus |
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| 冯伟功.一种反射式胆甾相液晶显示器研究.现代显示 81.2007,(81),44-48. |
| 冯伟功.一种反射式胆甾相液晶显示器研究.现代显示 81.2007,(81),44-48. * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106527008A (en) * | 2017-01-03 | 2017-03-22 | 京东方科技集团股份有限公司 | Display device and display apparatus |
| CN106527008B (en) * | 2017-01-03 | 2019-10-29 | 京东方科技集团股份有限公司 | A kind of display device and display device |
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| CN101339308A (en) | 2009-01-07 |
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