CN103105708A - Display device based on double-layer liquid crystal Fabry-Perot filter - Google Patents
Display device based on double-layer liquid crystal Fabry-Perot filter Download PDFInfo
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- CN103105708A CN103105708A CN2013100129959A CN201310012995A CN103105708A CN 103105708 A CN103105708 A CN 103105708A CN 2013100129959 A CN2013100129959 A CN 2013100129959A CN 201310012995 A CN201310012995 A CN 201310012995A CN 103105708 A CN103105708 A CN 103105708A
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Abstract
The invention discloses a display device based on a double-layer liquid crystal Fabry-Perot filter. The display device based on the double-layerliquid crystal Fabry-Perot filter comprises a pixelate double-layer liquid crystal Fabry-Perot filter composed of two layers of single-layer liquid crystal Fabry-Perot filters and a backlight module, wherein each single-layer liquid crystal Fabry-Perot filter comprises a plurality of array pixel units, the plurality of array pixel units of each layer of liquid crystal Fabry-Perot filters independently drives and transmits a pixel which has a central wavelength and does not shift, the pixel units of each layer of double-layer liquid crystal Fabry-Perot filters are mutually aligned, the backlight module is connected with the pixelate double-layer liquid crystal Fabry-Perot filter, provides backlight used for transmission to the pixelate double-layer liquid crystal Fabry-Perot filter and reflects backlight which is not transmitted. Because two layers of double-layer liquidcrystal Fabry-Perot filters are adopted to conduct gray scale adjustment, when the gray scales are modulated, the backlight is small in loss, after the gray scales are modulated, the central wavelength of emergent light does not shift, and meanwhile in the color modulating process, the backlight is small in loss and can be circularly used in the display device, and therefore use ratios of the backlight are greatly improved.
Description
Technical field
The present invention relates to the display device based on double-deck liquid crystal fp filter that centre wavelength is not offset and utilization factor backlight is large in display technology field, particularly a kind of transmitted light.
Background technology
The current thin film transistor liquid crystal shows to be that TFT-LCD has occupied the most of market share that shows market as the mainstream technology that shows the field, be widely used in little of hand-held mobile terminal, on greatly to 55 cun HDTV display screen.Although through development TFT-LCD technology is relatively ripe for a long time, all obtained approval widely aspect display performance in serviceable life, but this technology still has the place that much haves much room for improvement.For example existing TFT-LCD technology realizes the gray scale adjusting because the polarisation effect of utilizing liquid crystal on principle matches with polaroid, and utilize rgb filters to realize color adjustment, this absorptive-type element that all exists wherein causes whole optics utilization factor low, and the utilization factor backlight of commercial TFT-LCD display is general only in 5% left and right.
Although many trials have been done by industry and academia on the utilization factor backlight that improves the TFT-LCD demonstration, due to the restriction of its principle of work, as long as polaroid and optical filter still exist, this problem will still exist so.Therefore most research all is intended to use special structure or device to replace this two kinds of elements, such as Hsin-chu hand over rheum officinale second White Sect of Lamaism to award to be published in 2011 on JOURNAL OF DISPLAYTECHNOLOGY the 7th volume " Eco-Displays:The Color LCD ' s Without Color Filtersand Polarizers " thus in the Novel LCD mentioned just replaced polaroid and optical filter by the application of the technology such as Polymer Dispersed Liquid Crystal and the field backlight order demonstration of LED dot matrix, make utilization factor backlight significantly promote.But can make the profile of displaying contents thicken because the field order shows the color breakup (color breakup) that brings, still there are many potential problems in this novel liquid crystal display on using.And for example woods is happy gladly delivered on Journal of the Society for Information Display in 2009
The Novel LCD of mentioning in " Apolarizer-free flexible display using dye-doped liquid crystal gels ", break away from the restriction of polaroid light intensity is modulated thereby use dyestuff to mix liquid crystal, can not realize gratifying contrast but this dyestuff mixes liquid crystal.But these are all significant trials are subject to various reasons, all can not well solve the problem that present TFT-LCD faces.
Therefore, provide a kind of and can not rely on polaroid and colored filter, and can realize simultaneously real necessity that belongs to of scheme of the novel display device that color and gray scale are regulated.
Summary of the invention
In order to overcome the defective of prior art, the invention provides a kind of display device based on double-deck liquid crystal fp filter, the double-deck liquid crystal fp filter that comprises backlight module and be positioned at the pixelation of described backlight module top, described backlight module provides for the double-deck liquid crystal fp filter of described pixelation backlight that transmission uses, the double-deck liquid crystal fp filter of described pixelation is to described gray scale and the color modulation of carrying out backlight, wherein:
the double-deck liquid crystal fp filter of described pixelation comprises the individual layer liquid crystal fp filter of the two-layer pixelation in up and down, the individual layer liquid crystal fp filter of every layer of pixelation comprises some pixel cells of array, each pixel cell of the individual layer liquid crystal fp filter of every layer of pixelation mutually aligns and forms the two-layer pixel unit, and some pixel cells of the individual layer liquid crystal fp filter of described every layer of pixelation independently drive respectively, make the centre wavelength of the emergent light that transmits from the double-deck liquid crystal fp filter of described pixelation not be offset,
And the double-deck liquid crystal fp filter by described pixelation backlight that does not see through the double-deck liquid crystal fp filter of described pixelation is reflected back in described backlight module and re-uses.
Preferably, some pixel cells of the individual layer liquid crystal fp filter of described every layer of pixelation independently drive respectively, one of the transmission peaks of the individual layer liquid crystal fp filter of the two-layer pixelation in up and down is offset to the short wavelength, one to long wavelength shifted, by the stack of two transmission spectrums, make the centre wavelength of the emergent light that transmits from the double-deck liquid crystal fp filter of described pixelation not be offset.
Preferably, described pixel cell comprises:
The first substrate and the second substrate form respectively top layer and the bottom of described pixel cell;
Individual layer liquid crystal fp filter, it is between described the first substrate and the second substrate, liquid crystal layer between comprising multilayered medium reflection horizon, upper strata, lower floor's multilayered medium reflection horizon and being located at both, described liquid crystal layer is separated into red pixel liquid crystal layer, green pixel liquid crystal layer, blue pixel liquid crystal layer by insulating course;
Lower floor's public electrode, it is located between described individual layer liquid crystal fp filter and the second substrate;
And be located at red pixel upper electrode and driving circuit, green pixel upper electrode and driving circuit, blue pixel upper electrode and driving circuit between described individual layer liquid crystal fp filter and the first substrate, described red pixel upper electrode and driving circuit, green pixel upper electrode and driving circuit, blue pixel upper electrode and driving circuit are relative with described red pixel liquid crystal layer, green pixel liquid crystal layer, blue pixel liquid crystal layer position respectively.
Preferably, described red pixel upper electrode and driving circuit, green pixel upper electrode and driving circuit and blue pixel upper electrode and driving circuit are respectively described individual layer liquid crystal fp filter provides different voltage to make described individual layer liquid crystal fp filter transmit a pixel.
Preferably, described pixel comprises red sub-pixel, green sub-pixels and blue subpixels.
Preferably, red pixel upper electrode in the individual layer liquid crystal fp filter of the two-layer pixelation in described up and down and driving circuit provide respectively two different voltages to making one of its red transmission spectrum separately to long wavelength shifted with the individual layer liquid crystal fp filter that is connected separately, one is offset to the short wavelength
Green pixel upper electrode in the individual layer liquid crystal fp filter of the two-layer pixelation in described up and down and driving circuit provide respectively two different voltages to making one of its green transmission spectrum separately to long wavelength shifted with the individual layer liquid crystal fp filter that is connected separately, one is offset to the short wavelength
Blue pixel upper electrode in the individual layer liquid crystal fp filter of the two-layer pixelation in described up and down and driving circuit provide respectively two different voltages to making one of its blue transmission spectrum separately to long wavelength shifted with the individual layer liquid crystal fp filter that is connected separately, and one is offset to the short wavelength.
Preferably, each sub-pixel transmission spectrum of described individual layer liquid crystal fp filter pixel cell satisfies following formula:
Wherein: R is the reflectivity in reflection horizon, up and down; λ is the incident light vacuum wavelength, and n is the refractive index of liquid crystal layer, and θ is the angle of incident light and individual layer liquid crystal fp filter pixel cell surface normal, and l is the thickness of liquid crystal layer.
Preferably, the red transmission spectrum stack separately of the two-layer described individual layer liquid crystal fp filter in up and down, green transmission spectrum stack separately, blue transmission spectrum stack separately transmits respectively red sub-pixel, green sub-pixels and blue subpixels that centre wavelength is not offset.
What preferably, described backlight module sent is LED three coloured light.
Preferably,, described backlight module comprises LED three-color light source, light guide plate, diffusion sheet and anti-reflection film.
Compared with prior art, the invention has the advantages that:
1. do not rely on polaroid and realize gray modulation, adopt two-layer liquid crystal fp filter to carry out gray scale and regulate, in the gray modulation process loss backlight very little, and after can keeping carrying out gray scale and regulating, drift does not occur in the centre wavelength of emergent light;
2. do not rely on the absorption-type colored filter and realize color modulation, loss backlight is very little in the color modulation process;
3. the characteristic of utilizing the fp filter reflectivity to filter, make backlight can be recycling between the double-deck liquid crystal fp filter of pixelation and backlight module, greatly improved utilization factor backlight.
Certainly, implement arbitrary product of the present invention and might not need to reach simultaneously above-described all advantages.
Description of drawings
Fig. 1 is the display device structure schematic diagram based on double-deck liquid crystal fp filter of the embodiment of the present invention;
The pixel cell structure schematic diagram that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is the back light module unit structure schematic diagram of the embodiment of the present invention;
The schematic diagram based on the display device of double-deck liquid crystal fp filter that Fig. 4 provides for the embodiment of the present invention;
One sub-pixel transmission spectrum schematic diagram of the first individual layer liquid crystal fp filter that Fig. 5 provides for the embodiment of the present invention;
One sub-pixel transmission spectrum schematic diagram of the second individual layer liquid crystal fp filter that Fig. 6 provides for the embodiment of the present invention;
The sub-pixel transmission spectrum schematic diagram through the first and second individual layer liquid crystal fp filter that Fig. 7 provides for the embodiment of the present invention.
Embodiment
The present invention will be further described with specific embodiment by reference to the accompanying drawings in the below.
Embodiment
As shown in Figure 1, the present embodiment provides a kind of display device based on double-deck liquid crystal fp filter, the double-deck liquid crystal fp filter that it comprises backlight module 3 and is positioned at the pixelation of backlight module 3 tops, backlight module 3 provides for the double-deck liquid crystal fp filter of described pixelation backlight that transmission uses, and the double-deck liquid crystal fp filter of described pixelation is to gray scale and the color modulation of carrying out backlight;
the double-deck liquid crystal fp filter of wherein said pixelation comprises the individual layer liquid crystal fp filter of two-layer pixelation, the i.e. individual layer liquid crystal fp filter 2 of the individual layer liquid crystal fp filter 1 of the first pixelation and the second pixelation, the individual layer liquid crystal fp filter of each layer pixelation comprises respectively some pixel cells of array, some pixel cells of each layer drive respectively transmit the pixel that centre wavelength is not offset, and each pixel cell of the individual layer liquid crystal fp filter of the pixelation of every layer mutually aligns and forms the two-layer pixel unit,
And the double-deck liquid crystal fp filter by described pixelation backlight that does not see through the double-deck liquid crystal fp filter of described pixelation is reflected back in backlight module 3 and re-uses.
As shown in Figure 2, wherein said pixel cell comprises:
The first substrate 4 and the second substrate 5 form respectively top layer and the bottom of described pixel cell;
Individual layer liquid crystal fp filter, it is between described the first substrate 4 and the second substrate 5, and the liquid crystal layer between comprising multilayered medium reflection horizon, upper strata 6, lower floor's multilayered medium reflection horizon 7 and being located at both, described liquid crystal layer is separated into red pixel liquid crystal layer 8, green pixel liquid crystal layer 9, blue pixel liquid crystal layer 10 by insulating course 11;
Be located at the lower floor's public electrode 15 between described individual layer liquid crystal fp filter and the second substrate 5;
and be located at red pixel upper electrode and driving circuit 12 between described individual layer liquid crystal fp filter and the first substrate 4, green pixel upper electrode and driving circuit 13, blue pixel upper electrode and driving circuit 14, red pixel upper electrode and driving circuit 12, green pixel upper electrode and driving circuit 13, blue pixel upper electrode and driving circuit 14 respectively with red pixel liquid crystal layer 8, green pixel liquid crystal layer 9, blue pixel liquid crystal layer 10 positions relatively and be respectively red pixel liquid crystal layer 8, green pixel liquid crystal layer 9, blue pixel liquid crystal layer 10 provides separate voltage.
red pixel upper electrode and driving circuit 12, green pixel upper electrode and driving circuit 13 and blue pixel upper electrode and driving circuit 14 are respectively described individual layer liquid crystal fp filter provides different voltage to make described individual layer liquid crystal fp filter transmit a pixel, this pixel is by red sub-pixel, green sub-pixels and blue subpixels form, described red sub-pixel, green sub-pixels and blue subpixels transmission are respectively from red pixel liquid crystal layer 8, green pixel liquid crystal layer 9, blue pixel liquid crystal layer 10 positions transmit complete pixel of common formation.
The red pixel upper electrodes of described two alignment and driving circuit 12 provide respectively two different voltages to making its red transmission separately compose one to long wavelength shifted with the individual layer liquid crystal fp filter that is connected separately, and one is offset to the short wavelength;
The green pixel upper electrodes of described two alignment and driving circuit 13 provide respectively two different voltages to making one of its green transmission spectrum separately to long wavelength shifted with the individual layer liquid crystal fp filter that is connected separately, and one is offset to the short wavelength;
The blue pixel upper electrodes of described two alignment and driving circuit 14 provide respectively two different voltages to making its blue transmission separately compose one to long wavelength shifted with the individual layer liquid crystal fp filter that is connected separately, and one is offset to the short wavelength.The red transmission spectrum stack separately of two-layer described individual layer liquid crystal fp filter, green transmission spectrum stack separately, blue transmission spectrum stack separately transmits respectively red sub-pixel, green sub-pixels and the blue subpixels that centre wavelength is not offset.Each sub-pixel transmission spectrum of described individual layer liquid crystal fp filter pixel cell satisfies following formula:
Wherein: R=0.6 is the reflectivity in reflection horizon, up and down; λ is the incident light vacuum wavelength; N is the refractive index of liquid crystal layer; θ=0 is the angle of incident light and individual layer liquid crystal fp filter pixel cell surface normal; The l=320 nanometer is the thickness of liquid crystal layer.Individual layer liquid crystal fp filter pixel cell provides the voltage of appointment to form different equivalent refractive indexs to drive corresponding liquid crystal layer by red pixel upper electrode and driving circuit 12, green pixel upper electrode and driving circuit 13, blue pixel upper electrode and driving circuit 14, mediate with the centre wavelength to transmission spectrum.As shown in Figure 3, the LED lamp bar 22 that backlight module 3 is comprised of a plurality of RGB three-color LED chips 23, light guide plate 21, diffusion sheet 20 and anti-reflection film 19 form.Thereby formation comprises the backlight of three kinds of colors of RGB and uses for pixel.
As shown in Figure 4, the emergent light of backlight module 3 is comprised of red spectrum composition 16, green spectral composition 17, blue color spectrum composition 18, corresponding to the three-color LED that uses in backlight module; Because in the wavelength coverage of fp filter outside its transmission peaks not being absorbs but reflection, therefore for red sub-pixel, green sub-pixels, blue subpixels, the backlight of transmission will not be reflected back toward in backlight module 3, through anti-reflection film 19, diffusion sheet 20, the scattering of light guide plate 21, reflection form outgoing backlight again, and are utilized by other pixel, and so repeatedly recycling significantly improved utilization factor backlight.
As shown in Figure 5, when the refractive index of a liquid crystal layer that applies certain voltage and make the individual layer liquid crystal fp filter 1 of the first pixelation is n=1.63, the corresponding pixel transmission spectrum that obtains, the i.e. transmission spectrum of a green sub-pixels of the individual layer liquid crystal fp filter 1 of the first pixelation;
As shown in Figure 6, when the refractive index of a liquid crystal layer that applies certain voltage and make the individual layer liquid crystal fp filter 2 of the second pixelation is n=1.66, the corresponding pixel transmission spectrum that obtains, the transmission spectrum of the green sub-pixels that the individual layer liquid crystal fp filter 2 of the second pixelation is alignd with the green sub-pixels of the individual layer liquid crystal fp filter 1 of the first pixelation;
Be illustrated in figure 7 as the transmission spectrum that both is superimposed, thus modulated on intensity as shown in FIG. through twice filtered transmission spectrum, but the central homology wavelength still can maintain 532 nanometers.So individual layer liquid crystal fp filter of the two-layer independently pixelation in up and down, the strict alignment of its pixel cell also independently drives, make up and down by applying different voltage that one of the transmission peaks of two liquid crystal fp filter is offset to the short wavelength for the gray modulation unit that is formed by up and down two-layer liquid crystal fp filter alignment, one to long wavelength shifted, by the stack of two transmission spectrums, thereby realize drift is not occured for the adjusting of gray scale backlight and the centre wavelength that can keep carrying out the rear emergent light of gray scale adjusting.
A kind of display device based on double-deck liquid crystal fp filter provided by the invention does not rely on polaroid and realizes gray modulation, adopting two-layer liquid crystal fp filter to carry out gray scale regulates, loss backlight is very little in the gray modulation process, and after can keeping carrying out gray scale and regulating, drift does not occur the centre wavelength of emergent light; Simultaneously do not rely on the absorption-type colored filter and realize color modulation, loss backlight is very little in the color modulation process; Moreover the characteristic of utilizing the fp filter reflectivity to filter, make backlight can be recycling between the double-deck liquid crystal fp filter of pixelation and backlight module, greatly improved utilization factor backlight.
The above disclosed preferred embodiment of the present invention just is used for helping to set forth the present invention.Preferred embodiment does not have all details of detailed descriptionthe, does not limit this invention yet and only is described embodiment.Obviously, according to the content of this instructions, can make many modifications and variations.These embodiment are chosen and specifically described to this instructions, is in order to explain better principle of the present invention and practical application, thereby under making, the technical field technician can understand and utilize the present invention well.The present invention only is subjected to the restriction of claims and four corner and equivalent.
Claims (10)
1. display device based on double-deck liquid crystal fp filter, it is characterized in that, the double-deck liquid crystal fp filter that comprises backlight module and be positioned at the pixelation of described backlight module top, described backlight module provides for the double-deck liquid crystal fp filter of described pixelation backlight that transmission uses, the double-deck liquid crystal fp filter of described pixelation is to described gray scale and the color modulation of carrying out backlight, wherein:
the double-deck liquid crystal fp filter of described pixelation comprises the individual layer liquid crystal fp filter of the two-layer pixelation in up and down, the individual layer liquid crystal fp filter of every layer of pixelation comprises some pixel cells of array, each pixel cell of the individual layer liquid crystal fp filter of every layer of pixelation mutually aligns and forms the two-layer pixel unit, and some pixel cells of the individual layer liquid crystal fp filter of described every layer of pixelation independently drive respectively, make the centre wavelength of the emergent light that transmits from the double-deck liquid crystal fp filter of described pixelation not be offset,
And the double-deck liquid crystal fp filter by described pixelation backlight that does not see through the double-deck liquid crystal fp filter of described pixelation is reflected back in described backlight module and re-uses.
2. the display device based on double-deck liquid crystal fp filter as claimed in claim 1, it is characterized in that, some pixel cells of the individual layer liquid crystal fp filter of described every layer of pixelation independently drive respectively, one of the transmission peaks of the individual layer liquid crystal fp filter of the two-layer pixelation in up and down is offset to the short wavelength, one to long wavelength shifted, by the stack of two transmission spectrums, make the centre wavelength of the emergent light that transmits from the double-deck liquid crystal fp filter of described pixelation not be offset.
3. the display device based on double-deck liquid crystal fp filter as claimed in claim 3, is characterized in that, described pixel cell specifically comprises:
The first substrate and the second substrate form respectively top layer and the bottom of described pixel cell;
Individual layer liquid crystal fp filter, it is between described the first substrate and the second substrate, comprise multilayered medium reflection horizon, upper strata, lower floor's multilayered medium reflection horizon and be located at multilayered medium reflection horizon, upper strata and lower floor's multilayered medium reflection horizon between liquid crystal layer, described liquid crystal layer is separated into red pixel liquid crystal layer, green pixel liquid crystal layer, blue pixel liquid crystal layer by insulating course;
Lower floor's public electrode, it is located between described individual layer liquid crystal fp filter and the second substrate;
And be located at red pixel upper electrode and driving circuit, green pixel upper electrode and driving circuit, blue pixel upper electrode and driving circuit between described individual layer liquid crystal fp filter and the first substrate, described red pixel upper electrode and driving circuit, green pixel upper electrode and driving circuit, blue pixel upper electrode and driving circuit are relative with described red pixel liquid crystal layer, green pixel liquid crystal layer, blue pixel liquid crystal layer position respectively.
4. the display device based on double-deck liquid crystal fp filter as claimed in claim 4, it is characterized in that, described red pixel upper electrode and driving circuit, green pixel upper electrode and driving circuit and blue pixel upper electrode and driving circuit are respectively described individual layer liquid crystal fp filter provides different voltage to make described individual layer liquid crystal fp filter transmit a pixel.
5. the display device based on double-deck liquid crystal fp filter as claimed in claim 1 or 2, is characterized in that, described pixel comprises red sub-pixel, green sub-pixels and blue subpixels.
6. the display device based on double-deck liquid crystal fp filter as claimed in claim 5, is characterized in that,
Red pixel upper electrode in the individual layer liquid crystal fp filter of the two-layer pixelation in described up and down and driving circuit provide respectively two different voltages to making one of its red transmission spectrum separately to long wavelength shifted with the individual layer liquid crystal fp filter that is connected separately, one is offset to the short wavelength
Green pixel upper electrode in the individual layer liquid crystal fp filter of the two-layer pixelation in described up and down and driving circuit provide respectively two different voltages to making one of its green transmission spectrum separately to long wavelength shifted with the individual layer liquid crystal fp filter that is connected separately, one is offset to the short wavelength
Blue pixel upper electrode in the individual layer liquid crystal fp filter of the two-layer pixelation in described up and down and driving circuit provide respectively two different voltages to making one of its blue transmission spectrum separately to long wavelength shifted with the individual layer liquid crystal fp filter that is connected separately, and one is offset to the short wavelength.
7. the display device based on double-deck liquid crystal fp filter as claimed in claim 6, is characterized in that, each sub-pixel transmission spectrum of described individual layer liquid crystal fp filter pixel cell satisfies following formula:
Wherein: R is the reflectivity in levels multilayered medium reflection horizon; λ is the incident light vacuum wavelength; N is the refractive index of liquid crystal layer; θ is the angle of incident light and individual layer liquid crystal fp filter pixel cell surface normal; L is the thickness of liquid crystal layer.
8. the display device based on double-deck liquid crystal fp filter as claimed in claim 6, it is characterized in that, the red transmission spectrum stack separately of the two-layer described individual layer liquid crystal fp filter in up and down, green transmission spectrum stack separately, blue transmission spectrum stack separately transmits respectively red sub-pixel, green sub-pixels and blue subpixels that centre wavelength is not offset.
9. the display device based on double-deck liquid crystal fp filter as claimed in claim 1, is characterized in that, what described backlight module sent is LED three coloured light.
10. the display device based on double-deck liquid crystal fp filter as claimed in claim 9, is characterized in that, described backlight module comprises LED three-color light source, light guide plate, diffusion sheet and anti-reflection film.
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| CN114078451B (en) * | 2020-08-14 | 2023-05-02 | 京东方科技集团股份有限公司 | Display control method and display device |
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|---|---|
| CN103105708B (en) | 2015-10-14 |
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