[background technology]
LCD is a kind of passive type display device, in order to reach the colored effect that shows, colored filter need be provided, its effect is that the white light that will pass through is converted into the Red Green Blue light beam, cooperate thin film transistor (TFT) (Thin Film Transistor, TFT) layer and between other assemblies such as liquid crystal to reach the effect that shows the different color image.Colored filter generally is placed on upper substrate and tin indium oxide, and (Indium Tin Oxide ITO) between the electrode, mainly comprises black matrix" and dyed layer.
At present, manufacturing method of color filters adopts the pigment dispersing method substantially, and chromatic photoresist is coated on the substrate in the mode that rotation applies, and makes little shadow color lump through exposure imaging.The chromatic photoresist that is adopted in this method is organic components mostly, and principal ingredient has: high molecular polymer, interfacial agent, pigment and polymer monomer, wherein the poor heat resistance of pigment causes the colorrendering quality of colored filter relatively poor.In addition, because the particle diameter of pigment particles is bigger in the chromatic photoresist, generally be 1 * 10-8～2 * 10-7Rice, the scattering phenomenon that produces when light penetrates can cause the light transmittance of colored filter and contrast to descend.
[summary of the invention]
In order to overcome prior art colored filter poor heat resistance, light transmission rate and the low shortcoming of contrast, the invention provides the high colored filter of a kind of good heat resistance, light transmission rate and contrast.
The applied technical scheme of technical solution problem of the present invention is: a kind of colored filter is provided, comprise a plurality of pixels, each pixel comprises red, green, blue three sub-pixels, wherein comprise the nano particle of the transmitted spectrum scope that is used for controlling this each sub-pixel in these red, green, blue three sub-pixels, the particle diameter of this nano particle is 1 * 10-9～1 * 10-7Rice.
Compare with prior art, the invention has the beneficial effects as follows: comprise in the sub-pixel of colored filter of the present invention that particle diameter is 1 * 10-9～1 * 10-7The nano particle of rice, this nano particle can be controlled the transmitted spectrum scope of sub-pixel.Colored filter of the present invention has effects such as good heat resistance, light transmission rate and contrast height.
[embodiment]
Seeing also Fig. 1, is the structural representation of colored filter of the present invention.This colored filter 10 mainly comprises a plurality of pixels, each pixel comprises the sub-pixel 101,103,105 of red, green, blue three looks, black matrix" 102 is arranged between each sub-pixel, be used for blocking light by between each sub-pixel, prevent leakage of light and stop photoresist to mix, comprise that particle diameter is 1 * 10 in the sub-pixel 101,103,105 of these red, green, blue three looks-9～1 * 10-7The nano particle 104 of rice.This nano particle 104 can be a kind of or combination of aluminium, titanium, chromium, nickel, silver, zinc, molybdenum, tantalum, tungsten, palladium, copper, gold, platinum.Because when material exists with nano-scale, its electric conductivity, magnetic, resistive, physics and chemical characteristic all produce great variety.With regard to metal, because quantum confinement effect, when the atom number of particle reduces to a certain degree, it is discrete energy level that near the metal Fermi level electron level is become by quasi-continuum of level, and energy gap is more and more big, its optical absorption characteristics also changes, for example: golden nanometer particle with particle diameter from large to small, the color of its transmitted ray by golden yellow become be yellow, (radius is 1 * 10 to orange-7It is rice), green that (radius is 5 * 10-8Rice), (radius is 1.3 * 10 to kermesinus-8Rice).By the material and the radius of this nano particle 104 of suitable selection, can control the absorption spectrum of this nano particle 12, make this each sub-pixel transmission red, green, blue three coloured light lines respectively.
Nano particle in the sub-pixel of second embodiment of the invention colored filter is semiconductor or semiconductor compound nano particle.Because semiconductor or semiconductor compound nano particle great majority have fluorescent characteristic, can the absorption frequency higher ultraviolet or the light of visible waveband, and to transform with the fluorescence form be the luminous ray of other lower wave band of frequency, material and radius by this semiconductor of suitable selection or semiconductor compound nano particle, can control the absorption and the fluorescence spectrum of this nano particle, make this each sub-pixel outgoing red, green, blue three coloured light lines respectively.This nano particle can promote the light transmission rate of colored filter.
As shown in Figure 2, the nano particle in the sub-pixel of third embodiment of the invention colored filter is a core-shell nano 20.Core-shell nano is the nano particle that utilizes two semiconductors that energy gap varies in size or semiconducting compound to coat made mutually.This core-shell nano 20 is cadmium sulfide materials 201 of 2.5 electron-volts with energy gap by the zinc sulphide materials 203 coating energy gaps that are 3.7 electron-volts (eV), the electric hole that this zinc sulphide materials 203 can block these cadmium sulfide material 201 surfaces directly contacts with surrounding medium, has the surface function of deactivating, can promote the fluorescence efficiency of this cadmium sulfide material 201, so the fluorescence efficiency of this core-shell nano 20 is big than the zinc sulphide or the cadmium sulfide nano-particles of single component.
It is light absorbing material that colored filter of the present invention adopts metal, semiconductor or semiconductor compound nano particle to do, it is compared with the pigment of prior art has better heat-resisting, and the particle diameter of this nano particle is little than the particle diameter of pigment molecule, its scattering phenomenon is less, can promote the light transmission rate and the contrast of this colored filter; And the fluorescent characteristic of semiconductor or semiconductor compound nano particle can transform the luminous ray of ultraviolet or other wavelength coverage, promotes light transmission rate; Nuclear shell type nano meter particle can promote the fluorescence transformation efficiency.But this nano particle metal, semiconductor or semiconducting compound, by material, particle diameter, the shape that changes this nano particle, control the optical absorption characteristics and the fluorescent characteristic of this nano particle, and then the light by this colored filter is filtered or transforms.
It is described that colored filter of the present invention is not limited to above-mentioned embodiment, is not limited to homogenous material as nano particle, can be the combination of above-mentioned material; For the nano particle of same material and size, the change of shape also can change its optical absorption characteristics, has nothing in common with each other as the light color of triangle, prism shape or the transmission of circular nano particle institute.