CN103869528A - Liquid crystal display module - Google Patents
Liquid crystal display module Download PDFInfo
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- CN103869528A CN103869528A CN201410112438.9A CN201410112438A CN103869528A CN 103869528 A CN103869528 A CN 103869528A CN 201410112438 A CN201410112438 A CN 201410112438A CN 103869528 A CN103869528 A CN 103869528A
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Abstract
The invention provides a liquid crystal display module. The liquid crystal display module comprises a liquid crystal display, a first polarizer, a second polarizer, a light guide board and a light source, wherein the light source is arranged on one side of the light guide board; the wave length of light rays emitted by the light source ranges from 350 nm to 480 nm. The liquid crystal display module further comprises a light conversion layer between the liquid crystal display and the light guide board, the light conversion layer comprises fluorescent powder, the content of the fluorescent powder at different lengths of the light conversion layer increases along with increasing of the distance between the light conversion layer and the light source, and the fluorescent powder can be red fluorescent powder and green fluorescent powder, or can be red fluorescent powder, green fluorescent powder and blue fluorescent powder; the length of the light conversion layer is the size of the edge, perpendicular to the light source, of the light conversion layer. The uniformity of luminance of a picture displayed by the liquid crystal display module with the light source arranged on the lower side portion is higher.
Description
Technical field
The present invention relates to display technique field, more particularly, relate to a kind of liquid crystal display module.
Background technology
Liquid crystal display module generally includes: liquid crystal display; Be arranged at first polaroid in liquid crystal display front; Be arranged at second polaroid at the liquid crystal display back side; Be arranged at the second polaroid and deviate from the light guide plate in liquid crystal display one side; Light source.Liquid crystal display itself is non-luminous, need to emit beam by light source, utilizes light guide plate that light is converted to area source, and this area source sees through liquid crystal display and enters human eye, and human eye just can be observed display frame.
The setting position of light source in liquid crystal display module is generally two kinds: one is straight-down negative, light source is arranged at the back side (light guide plate deviates from the one side of liquid crystal display) of light guide plate, this setup can occupy the thickness that liquid crystal display module is suitable, does not meet the hand-held electronic equipment such as mobile phone, panel computer to the lightening demand of product; Another kind is side following formula, light source is arranged at the side of light guide plate, although the liquid crystal display module thickness of this structure can be accomplished very thin, but its brightness uniformity is often poor, as shown in Figure 1, along with the increase of light source 102 distances, the transmission range of light in light guide plate 103 is more and more far away, the brightness meeting of liquid crystal display 101 declines gradually, causes the inhomogeneous of display frame brightness.
Summary of the invention
The invention provides a kind of liquid crystal display module, the problem of caused display frame brightness irregularities is set to solve light source side following formula.
For achieving the above object, the invention provides following technical scheme:
A kind of liquid crystal display module, comprising: liquid crystal display, the first polaroid, the second polaroid, light guide plate and light source, and described light source is arranged at a side of described light guide plate, and the wavelength coverage of the light that described light source sends is: 350nm～480nm; Described liquid crystal display module also comprises: the light conversion layer between described liquid crystal display and light guide plate, described light conversion layer comprises fluorescent powder, described fluorescent powder at the content at described light conversion layer different length place all with increasing with the increase of described light source distance; Wherein, described fluorescent powder is red fluorescence powder and green emitting phosphor, or described fluorescent powder is red fluorescence powder, green emitting phosphor and blue colour fluorescent powder; The length of described light conversion layer is the size of described light conversion layer perpendicular to the limit of described light source.
Preferably, the even thickness of described light conversion layer, the distributed density of described fluorescent powder in described light conversion layer is with increasing with the increase of described light source distance.
Preferably, the thickness of described light conversion layer is with increasing with the increase of described light source distance, and the distributed density of described fluorescent powder in described light conversion layer is identical everywhere.
The thickness of the structure that preferably, described light conversion layer forms with the second polaroid is identical everywhere.
Preferably, described light conversion layer favours described liquid crystal display with the one side that described the second polaroid contacts, and described light conversion layer is parallel to described liquid crystal display away from the one side of described the second polaroid; The thickness of described the second polaroid is with reducing with the increase of described light source distance, the one side that described the second polaroid contacts with described light conversion layer favours described liquid crystal display, and described the second polaroid is parallel to described liquid crystal display away from the one side of described light conversion layer.
Preferably, described light conversion layer is between described liquid crystal display and the second polaroid, or described light conversion layer is between described the second polaroid and light guide plate.
Preferably, described light source is blue led chip or purple LED chip.
Preferably, described fluorescent powder is quantum dot fluorescence powder.
Preferably, the surface of described fluorescent powder has coating material, to prevent that described fluorescent powder from reuniting.
Preferably, described coating material is at least one in KH550, KH560 and KH570.
Compared with prior art, technical scheme provided by the present invention at least has the following advantages:
Liquid crystal display module provided by the present invention, by the fluorescent powder of traditional coated light source is arranged between liquid crystal display and light guide plate, form a light conversion layer, this light conversion layer at the content of the fluorescent powder at different length place all with increasing with the increase of light source distance, fluorescent powder is acted on increasing with the increase of light source distance blocking of light, owing to extremely reducing gradually away from the direction glazed thread of light source along close light source, therefore in whole liquid crystal display module plane, white photodistributed homogeneity is improved, thereby improve the brightness uniformity of the liquid crystal display module display frame of light source side following formula setting.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram of distribution of light in the liquid crystal display module that in prior art, light source side following formula arranges;
The structural drawing of a kind of liquid crystal display module that Fig. 2 provides for the embodiment of the present invention;
The structural drawing of the another kind of liquid crystal display module that Fig. 3 provides for the embodiment of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
A lot of details are set forth in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here and implement, those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that, and therefore the present invention is not subject to the restriction of following public specific embodiment.
Secondly, the present invention is described in detail in conjunction with schematic diagram, in the time that the embodiment of the present invention is described in detail in detail; for ease of explanation; the sectional view of indication device structure can be disobeyed general ratio and be done local amplification, and described schematic diagram is example, and it should not limit the scope of protection of the invention at this.In addition in actual fabrication, should comprise, the three-dimensional space of length, width and the degree of depth.
The present embodiment provides a kind of liquid crystal display module, and as shown in Figure 2, described liquid crystal display module comprises: liquid crystal display 201, the first polaroid 202, the second polaroid 203, light conversion layer 204, light guide plate 205 and light source 206.
Wherein, described liquid crystal display 201 generally includes: two substrates, and liquid crystal layer between two substrates, liquid crystal display 201 for the one side that shows image for positive, with the one side of described vis-a-vis be the back side of liquid crystal display 201.
Described the first polaroid 202 is positioned at the front of liquid crystal display 201.
Described the second polaroid 203 is positioned at the back side of liquid crystal display 201, and the absorption axes of the second polaroid 203 is mutually vertical with the absorption axes of the first polaroid 202.
Described light conversion layer 204 is between liquid crystal display 201 and light guide plate 205, in light conversion layer 204, comprise fluorescent powder, fluorescent powder at the content at light conversion layer 204 different length places all with increasing with the increase of light source 206 distances, fluorescent powder can be red fluorescence powder and green emitting phosphor, or can be red fluorescence powder, green emitting phosphor and blue colour fluorescent powder, and the distribution of the fluorescent powder of different colours in light conversion layer 204 is random.
It should be noted that, " length " of described light conversion layer 204 is light conversion layer 204 is strip structure perpendicular to light source 206(light source 206, can be considered straight line at this) the size on limit.
In the present embodiment, light conversion layer 204 preferably can be between liquid crystal display 201 and the second polaroid 203, or also can be between the second polaroid 203 and light guide plate 205.Light conversion layer 204, in the time making, preferably can be formed on the second polaroid 203.
For realize fluorescent powder at the content at light conversion layer 204 different length places all with the object increasing with the increase of light source 206 distances, the present embodiment preferably provides following concrete implementation:
Make the thickness of light conversion layer 204 with increasing with the increase of light source 206 distances, the distributed density of fluorescent powder in light conversion layer 204 is identical everywhere, as shown in Figure 2.In this concrete implementation, the variable thickness of light conversion layer 204 causes, for liquid crystal display module integral plaster is closed closely, between each layer of structure, do not produce space, preferably can be by the thickness matching design of the thickness of the second polaroid 203 and light conversion layer 204, the structure that finally makes light conversion layer 204 form with the second polaroid 203 is a thickness identical structure everywhere.Preferably, light conversion layer 204 favours liquid crystal display 201 with the one side that the second polaroid 203 contacts, and light conversion layer 204 is parallel to liquid crystal display 201 away from the one side of the second polaroid 203; Match with light conversion layer 204, the thickness of the second polaroid 203 can be with reducing with the increase of light source 206 distances, the one side that the second polaroid 203 contacts with light conversion layer 204 favours liquid crystal display 201, and the second polaroid 203 is parallel to liquid crystal display 201 away from the one side of light conversion layer 204.
In above-mentioned concrete implementation, more weak apart from the area light intensity that light source 206 is far away, the thickness of light conversion layer 304 is with increasing with the increase of light source 206 distances simultaneously, the effect of blocking of the more multipair light of fluorescent powder is stronger, thereby high strength light penetrates thick fluorescent powder film layer (being light conversion layer 204), low-intensity light penetrates thin fluorescent powder film layer, makes light from light conversion layer 204 outgoing, and brightness is more even.
In the present embodiment, make fluorescent powder at the content at light conversion layer different length place with increasing implementation concrete below also can adopting with the increase of light source distance:
Make the even thickness of light conversion layer 304, the distributed density of fluorescent powder in light conversion layer 304 is with increasing with the increase of light source 206 distances, as shown in Figure 3.In the time making light conversion layer 304, can be equipped with the gluey thing of fluorescent powder of variable concentrations, in the gluey thing of fluorescent powder of this variable concentrations, all at least comprise redness and green emitting phosphor, and the fluorescent powder of different colours equal stochastic distribution in the gluey thing of the fluorescent powder of variable concentrations, the order then gluey fluorescent powder of variable concentrations thing being increased progressively successively according to distributed density be arranged at light conversion layer 304 gradually away from the diverse location place of light source 206.
In above-mentioned concrete implementation, the thickness of the second polaroid 303 is preferably identical everywhere.
In above-mentioned concrete implementation, more weak apart from the area light intensity that light source 206 is far away, the distributed density of light conversion layer 304 interior fluorescent powder is with increasing with the increase of light source 206 distances simultaneously, the effect of blocking of the more multipair light of fluorescent powder is stronger, thereby high strength light penetrates the fluorescent powder of high concentration, low-intensity light penetrates the fluorescent powder of low concentration, makes light from light conversion layer 304 outgoing, and brightness is more even.
It should be noted that, the present embodiment is only take above-mentioned two kinds of concrete implementations as example, to how to make fluorescent powder at the content at light conversion layer different length place all with increasing and describe with the increase of light source distance, in other embodiments of the invention, also can adopt other technological means make fluorescent powder at the content at light conversion layer different length place all with increasing with the increase of light source distance.
In the present embodiment, the fluorescent powder comprising in light conversion layer preferably can be quantum dot fluorescence powder.The basic composition element of quantum dot fluorescence powder is Cd(cadmium), Se(selenium), Zn(zinc), S(sulphur) etc., there is photoluminescence effect, be greater than at energy under the irradiation of photon of its band gap width, can absorb the energy of this photon, and send intrinsic light (being that photon energy equals its band gap width) through series of physical process.Utilize the principle of luminosity of quantum dot fluorescent powder, in the present embodiment, utilize light source to send to have the light of high-energy photons, absorb for quantum dot fluorescence powder, the final white light needing that produces.
Because the particle diameter of quantum dot fluorescence powder particles is generally less than 10nm, therefore particle shows strong quantum effect, luminescent spectrum is much narrow compared with common phosphors, FWHM(Full Width at Half Maximum, halfwidth) be even less than 20nm, therefore the pure degree of its light-emitting line color is higher, and the color saturation of display frame is improved greatly.
It should be noted that, so-called " FWHM " refers to the overall with at half bands of a spectrum of absorption band maximum height.Color saturation refers to color weight or the vividness of light.
In addition, in prior art, the fluorescent powder that liquid crystal display module uses is common phosphors, the fluorescent powder of different colours, and material is also different, and the mutual pollution that this can cause between different materials, finally affects image quality; In the present embodiment, fluorescent powder in light conversion layer is set to quantum dot fluorescence powder, because the color of quantum dot fluorescence powder depends on the size of its particle diameter, particle diameter difference, color difference, therefore the fluorescent powder of the different colours in light conversion layer is commaterial, has avoided the mutual problem of polluting between different materials, can effectively improve image quality.
It should be noted that, due to the particle diameter of quantum dot fluorescence powder minimum (being conventionally less than 10nm), polarity is strong, easily reunite, tend to cause its luminescence efficiency sharply to decline and reunite, in the present embodiment, the preferred surperficial coating surface dressing agent at fluorescent powder, fluorescent powder is carried out to finishing, to prevent that fluorescent powder from reuniting, can be in medium better disperse distribute.Described coating material is at least one in KH550, KH560 and KH570 etc. preferably.
Described light source 206 is arranged at a side of light guide plate 205, the wavelength coverage of the light that light source 206 sends is: 350nm～480nm, the light that preferred light source 206 sends is blue light, royal purple light or purple light etc., and light source 206 is blue led chip or purple LED chip.
It should be noted that, and unlike in traditional backlight, the jelly of the involved fluorescent powder of luminescence chip is coated, the light source 206 that the present embodiment provides is the luminescence chip of the not coated jelly containing fluorescent powder in surface preferably.
If the fluorescent powder comprising in light conversion layer is redness, green and blue colour fluorescent powder, the light that light source 206 sends is absorbed by fluorescent powder completely, produces white light; If the fluorescent powder comprising in light conversion layer is redness and green emitting phosphor, the light that light source 206 sends is not absorbed by fluorescent powder completely, also has part residue, forms needed white light together with the light that remaining light sends with fluorescent powder.
In the present embodiment, by the fluorescent powder of traditional coated light source is arranged between liquid crystal display and light guide plate, form a light conversion layer, this light conversion layer at the content of the fluorescent powder at different length place all with increasing with the increase of light source distance, fluorescent powder is acted on increasing with the increase of light source distance blocking of light, owing to extremely reducing gradually away from the direction glazed thread of light source along close light source, therefore in whole liquid crystal display module plane, white photodistributed homogeneity is improved, thereby improve the brightness uniformity of the liquid crystal display module display frame of light source side following formula setting,
Further, fluorescent powder in the present embodiment in light conversion layer is set to quantum dot fluorescence powder, because the luminescent spectrum of quantum dot fluorescence powder is very narrow, therefore the pure degree of its light sending is very high, is conducive to improve the color saturation of liquid crystal display module display frame; And because the color of quantum dot fluorescence powder is determined by the particle diameter of himself, therefore in light conversion layer, the phosphor material powder of different colours is identical, thereby the problem of mutually polluting between the different materials of having avoided adopting common phosphors to cause has improved image quality.
Although the present invention discloses as above with preferred embodiment, but not in order to limit the present invention.Any those of ordinary skill in the art, do not departing from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible variations and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not depart from technical solution of the present invention,, all still belongs in the scope of technical solution of the present invention protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present invention.
Claims (10)
1. a liquid crystal display module, comprise: liquid crystal display, the first polaroid, the second polaroid, light guide plate and light source, described light source is arranged at a side of described light guide plate, it is characterized in that, the wavelength coverage of the light that described light source sends is: 350nm～480nm;
Described liquid crystal display module also comprises: the light conversion layer between described liquid crystal display and light guide plate, described light conversion layer comprises fluorescent powder, described fluorescent powder at the content at described light conversion layer different length place all with increasing with the increase of described light source distance;
Wherein, described fluorescent powder is red fluorescence powder and green emitting phosphor, or described fluorescent powder is red fluorescence powder, green emitting phosphor and blue colour fluorescent powder; The length of described light conversion layer is the size of described light conversion layer perpendicular to the limit of described light source.
2. liquid crystal display module according to claim 1, is characterized in that, the even thickness of described light conversion layer, and the distributed density of described fluorescent powder in described light conversion layer is with increasing with the increase of described light source distance.
3. liquid crystal display module according to claim 1, is characterized in that, the thickness of described light conversion layer is with increasing with the increase of described light source distance, and the distributed density of described fluorescent powder in described light conversion layer is identical everywhere.
4. liquid crystal display module according to claim 3, is characterized in that, the thickness of the structure that described light conversion layer forms with the second polaroid is identical everywhere.
5. liquid crystal display module according to claim 4, it is characterized in that, described light conversion layer favours described liquid crystal display with the one side that described the second polaroid contacts, and described light conversion layer is parallel to described liquid crystal display away from the one side of described the second polaroid;
The thickness of described the second polaroid is with reducing with the increase of described light source distance, the one side that described the second polaroid contacts with described light conversion layer favours described liquid crystal display, and described the second polaroid is parallel to described liquid crystal display away from the one side of described light conversion layer.
6. liquid crystal display module according to claim 1, is characterized in that, described light conversion layer is between described liquid crystal display and the second polaroid, or described light conversion layer is between described the second polaroid and light guide plate.
7. liquid crystal display module according to claim 1, is characterized in that, described light source is blue led chip or purple LED chip.
8. according to the liquid crystal display module described in claim 1～7 any one, it is characterized in that, described fluorescent powder is quantum dot fluorescence powder.
9. liquid crystal display module according to claim 8, is characterized in that, the surface of described fluorescent powder has coating material, to prevent that described fluorescent powder from reuniting.
10. liquid crystal display module according to claim 9, is characterized in that, described coating material is at least one in KH550, KH560 and KH570.
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| CN105676532A (en) * | 2016-03-18 | 2016-06-15 | 纳晶科技股份有限公司 | Light conversion membrane, backlight module and display device |
| WO2017084156A1 (en) * | 2015-11-16 | 2017-05-26 | 深圳市华星光电技术有限公司 | Display apparatus using quantum dot membrane |
| CN107102475A (en) * | 2017-06-08 | 2017-08-29 | 合肥京东方显示光源有限公司 | A kind of backlight module and display device |
| WO2018209785A1 (en) * | 2017-05-16 | 2018-11-22 | 深圳市华星光电技术有限公司 | Light guide plate, backlight module, and display device |
| WO2019085173A1 (en) * | 2017-11-01 | 2019-05-09 | 惠州市华星光电技术有限公司 | Liquid crystal display |
| CN110196511A (en) * | 2019-05-24 | 2019-09-03 | 武汉天马微电子有限公司 | Quantum dot film and manufacturing method thereof, backlight module and display device |
| US10649129B2 (en) | 2017-05-16 | 2020-05-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Light guide plate, backlight module and display device |
| CN113156569A (en) * | 2021-04-23 | 2021-07-23 | 常州亚玛顿股份有限公司 | Low-color-cast backlight module |
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| CN113156569A (en) * | 2021-04-23 | 2021-07-23 | 常州亚玛顿股份有限公司 | Low-color-cast backlight module |
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