CN109426034A - Liquid crystal display device - Google Patents

Abstract

The invention relates to a liquid crystal display device, comprising: a backlight module and a liquid crystal module located on an optical path of the backlight module, the liquid crystal module includes a first conductive substrate facing the backlight module, and a second A second conductive substrate separated from the conductive substrates and a liquid crystal layer disposed between the first conductive substrate and the second conductive substrate, wherein the second conductive substrate includes sequentially positioned in the light-emitting direction of the backlight module The transparent conductive layer, the light conversion layer and the color filter layer on the top of the layer, and the liquid crystal layer is located between the first conductive substrate and the transparent conductive layer, and the light conversion layer is used for the backlight module. The emitted light is color-converted, and the color filter layer is used for filtering the light emitted from the light conversion layer, so that the emitted light from the color filter layer is monochromatic light.

Description

Liquid crystal display device

technical field

The present invention relates to a liquid crystal display device.

Background technique

LED display technology has the advantages of high brightness, environmental protection and energy saving, fast response speed, impact resistance and stable performance. Traditional LED displays generally use semiconductor materials to achieve different colors of light, such as gallium arsenide phosphide diodes to emit red light, gallium phosphide diodes to emit green light, indium gallium nitride diodes to emit blue light, and three-color LEDs to mix light to achieve color display. However, the color rendering of white light obtained in this way is insufficient, and cannot meet specific light output requirements.

SUMMARY OF THE INVENTION

In view of this, it is necessary to provide a liquid crystal display device that can solve the above technical problems.

A liquid crystal display device, comprising: a backlight module and a liquid crystal module located on an optical path of the backlight module, the liquid crystal module includes a first conductive substrate facing the backlight module, and a first conductive substrate A second conductive substrate spaced apart and a liquid crystal layer disposed between the first conductive substrate and the second conductive substrate, wherein the second conductive substrate comprises transparent transparent substrates that are sequentially positioned in the light-emitting direction of the backlight module A conductive layer, a light conversion layer and a color filter layer, and the liquid crystal layer is located between the first conductive substrate and the transparent conductive layer, and the light conversion layer is used for light emitted from the backlight module Color conversion is performed, and the color filter layer is used for filtering the light emitted from the light conversion layer, so that the light emitted from the color filter layer is monochromatic light.

Further, the second conductive substrate further includes a transparent substrate, the transparent substrate is the outermost layer of the liquid crystal module, and the light conversion layer and the color filter layer are located between the transparent substrate and the transparent substrate. between the conductive layers.

Further, the light conversion layer is formed on the transparent conductive layer, and the light conversion layer includes a plurality of fluorescent color blocks repeatedly arranged according to a certain rule; the color filter layer is formed on the light conversion layer , the color filter layer includes a plurality of filter color blocks that are repeatedly arranged according to a certain rule, and the filter color blocks and the fluorescent color blocks are in one-to-one correspondence with positions and colors.

Further, the first conductive substrate further includes a black matrix layer, the black matrix layer separates the phosphor layer and the color filter layer into a plurality of parts spaced apart from each other, and the height of the black matrix layer is equal to the height of the light The sum of the heights of the conversion layer and the color filter layer.

Further, the light conversion layer includes a transparent polymer and quantum dots formed in the transparent polymer.

Further, the material of the light conversion layer is red phosphor, blue phosphor or green phosphor.

Further, the backlight module is a direct type backlight module or an edge type backlight module.

Further, the backlight module is a direct type backlight module, which includes a circuit board, light-emitting diodes arranged on the circuit board at intervals, a secondary optical lens arranged on the circuit board and located on the light-emitting light path of the light-emitting diodes, and An optical film placed in front of the secondary optical lens.

Further, the first conductive substrate further includes a black matrix layer, the black matrix layer only separates the light conversion layer into a plurality of parts spaced apart from each other, and the color filter layer covers the black matrix layer and all the parts. the surface formed by the light conversion layers.

Further, the color filter layer includes a base layer, the filter color blocks are formed in the base layer, the black matrix layer is formed on the base layer, and the filter color blocks are formed on the base layer. The fluorescent color blocks correspond one by one.

The present invention also relates to another liquid crystal display device.

A liquid crystal display device, comprising: a backlight module and a liquid crystal module located on an optical path of the backlight module;

The backlight module includes a reflective plate and a light-emitting diode chip;

The liquid crystal module includes a first conductive substrate facing the reflective plate, a second conductive substrate spaced from the first conductive substrate, and a liquid crystal layer disposed between the first conductive substrate and the second conductive substrate; The light-emitting diode chip is disposed on the surface of the first conductive substrate facing the reflective plate; the second conductive substrate includes a transparent conductive layer, a light conversion layer and a color filter that are sequentially located in the light-emitting direction of the backlight module. a light layer, and the liquid crystal layer is located between the first conductive substrate and the transparent conductive layer; the light conversion layer is used for color conversion of the light emitted by the backlight module, and the color filter The layers are used to filter the light exiting the light converting layer so that each color of light exiting the light converting layer maintains its own monochromaticity.

Compared with the prior art, the present invention provides the liquid crystal display device provided by the present invention. By arranging a color filter layer on the light exit light path of the light conversion layer, the color filter layer can perform different wavelengths of light emitted by the light conversion layer on the color filter layer. By filtering, the outgoing light of each color maintains its own monochromaticity, so that the liquid crystal device can produce visual effects with high contrast ratio and high color rendering.

Description of drawings

FIG. 1 is a structural diagram of a liquid crystal display device according to a first embodiment of the present invention.

2 to 4 are graphs showing the relationship between spectral intensity and wavelength.

FIG. 5 is a structural diagram of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 6 is a top view of a color filter layer included in the liquid crystal display device provided in FIG. 5 .

FIG. 7 is a structural diagram of a liquid crystal display device according to a third embodiment of the present invention.

Description of main component symbols

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described with reference to the above drawings.

Detailed ways

The liquid crystal display device provided by the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

first embodiment

Please refer to FIG. 1 , which is a liquid crystal display device 100 provided by the present invention, which includes a backlight module 10 and a liquid crystal module 20 located on an optical path of the backlight module 10 . In this embodiment, the backlight module 10 is a direct type backlight module.

The backlight module 10 includes a circuit board 11, light-emitting diodes 12 arranged on the circuit board 11 at intervals, a secondary optical lens 13 arranged on the circuit board 11 and located on the light-emitting path of the light-emitting diodes 12, and located on the light-emitting diodes 12 to emit light. The diffuser plate 14 arranged in front of the secondary optical lens 13 on the optical path, and the optical film 15 arranged in front of the diffuser plate 14 . The backlight module 10 is used for providing the backlight of the liquid crystal display device 100 .

The light emitting diode 12 can be a UV light source or a three-primary LED light source, or a combination of a UV light source and a three-primary-color LED light source.

The secondary optical lens 13 is disposed on the circuit board 11 and covers the outside of each of the light-emitting diodes 12 , and the secondary optical lens 13 is used to homogenize the light emitted by the light-emitting diodes 12 . That is to say, the secondary optical lens 13 is used to weaken the light intensity directly above the light emitting diode 12 and increase the light intensity of the surrounding area of the light emitting diode 12, so as to balance the light intensity of the middle and surrounding areas of the light emitting diode 12, so that the backlight module 10 The output brightness is more uniform.

In this embodiment, the inner surface of the secondary optical lens 13 is an elliptical surface, and the central axis of the secondary optical lens 13 coincides with the long axis of the elliptical surface; the outer surface of the secondary optical lens 13 It is a semicircular surface, and the light emitted from the light-emitting diode 12, the light from the center of the light-emitting diode 12 is vertically incident to the vertex of the secondary optical lens, and exits from the vertex, and the light-emitting diode 12 is refracted except for the light at the center. To the side of the secondary optical lens 13, in this way, the brightness directly above the light-emitting diode is prevented from being too strong, so as to achieve the effect of uniform light.

The diffuser plate 14 is used to randomly change the path of the incident light, further homogenize the light emitted from the secondary optical lens 13, and improve the brightness uniformity of the incident light.

The optical film 15 may be a light guide plate or a light enhancement film (Light Enhancemnt Film).

It can be understood that, in other implementations, the backlight module 10 may also be an edge-lit backlight module.

The liquid crystal module 20 includes a first conductive substrate 21 facing the backlight module 10 , a second conductive substrate 22 spaced from the first conductive substrate 21 , and disposed on the first conductive substrate 21 and the second conductive substrate 22 . The liquid crystal layer 23 in between.

The first conductive substrate 21 is disposed toward the backlight module 10, the first conductive substrate 21 is a thin film crystal array substrate (Thin Film Transistor, TFT), and the thin film transistor (not shown) is disposed on the first A surface of the conductive substrate 21 facing the liquid crystal layer 23 .

The second conductive substrate 22 includes a transparent conductive layer 220, a light conversion layer 222, a color filter layer 224, a black matrix layer 226, and a transparent substrate 228 . Specifically, the black matrix layer 226 is formed on the surface of the transparent substrate 228, the black matrix layer 226 includes a plurality of gaps 223, the light conversion layer 222 and the color filter layer 224 are stacked and arranged in in the gap 223 .

The transparent conductive layer 220 is made of indium tin oxide (ITO). The liquid crystal layer 23 is sandwiched between the transparent conductive layer 220 and the first conductive substrate 21 . When a potential difference is applied to the transparent conductive layer 220 and the first conductive substrate 21, an electric field is generated between them. The liquid crystals of the liquid crystal layer 23 change their alignment in response to an electric field applied to them, thereby changing the local light transmittance of the liquid crystal layer 23 .

The light conversion layer 222 is a light conversion member that converts the properties of incident light. Specifically, the light conversion layer 222 is a wavelength conversion element that converts the wavelength of incident light.

The light conversion layer 222 includes a transparent polymer and phosphors formed in the transparent polymer. For example, the light conversion layer 222 may include red fluorescent color patches 2220 formed by red fluorescent powder, green fluorescent color patches 2220 formed by green fluorescent powder, and blue fluorescent color patches 2220 formed by blue fluorescent powder.

The red phosphor can be potassium fluorosilicate (KSF, (K2(SiF6):Mn4+), SLA(Sr(LiAl3N4):Eu2+) or SiAlON(SiAlON:Eu2+).

The green phosphor can be nitrides (Oxy-Nitrides, Carbido-Nitrides) or CaAlSiN3:Eu2+, or silicides (Silicates, Oxy/Ortho-Silicates).

The blue phosphor can have the chemical formula: ZnS:Ag (zinc sulfide:silver), ZnS:Zn (zinc sulfide:zinc), ZnS:Ag (zinc sulfide:silver), (Ba,Eu)Mg2Al16O27, BaMgAl10O17:Eu, Mn, Ca5F(PO4)3:Sb, (Ca,Sr,Ba)3(PO4)2Cl2:Eu, (Sr,Ca,Ba)10(PO4)6Cl2:Eu.

The light conversion layer 222 may also be a transparent polymer and quantum dots formed in the transparent polymer. The quantum dots may include at least one of group II compound semiconductors, group III compound semiconductors, group V compound semiconductors, and group VI compound semiconductors. More specifically, the nanocrystalline core may include CdSe, InGaP, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe, or HgS. Additionally, the nanocrystalline shell may include CuZnS, CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe, or HgS. The quantum dots can have a diameter of about 1 nm to about 10 nm.

The light conversion layer 222 is used to convert the light emitted by the light emitting diode 12 into light of a specific color. For example, if the light emitting diode 12 is a blue light emitting diode, the light conversion layer 222 converts the blue light output upward from the backlight module 10 into green light or red light.

Specifically, the light conversion layer 222 converts a portion of the blue light into green light having a wavelength in a range of about 520 nm to about 560 nm, and converts a portion of the blue light into red light having a wavelength in a range of 630 nm to about 660 nm.

In this embodiment, the light emitting diode 12 is an ultraviolet (UV) light emitting diode, and the light conversion layer 222 converts the UV light output upward from the backlight module 10 into blue light, green light and red light. Specifically, the light conversion layer 222 converts a portion of the UV light into blue light having a wavelength in a range of about 430 nm to about 470 nm, a portion of the UV light into green light having a wavelength in a range of about 520 nm to about 560 nm, and A portion of the UV light is converted to red light having a wavelength in the range of about 630 nm to about 660 nm.

The color filter layer 224 includes a plurality of three primary color filter color blocks 2240 that are repeatedly arranged according to a certain rule. The three primary colors include red, green, and blue. The blue filter patch allows only blue light to pass through and blocks green and red light; the red filter patch allows only red light to pass through and blocks green and blue light; the green filter patch allows only green light to pass through , and blocks blue and red light. Each of the filter color blocks 2240 and the corresponding fluorescent color blocks 2220 have the same color and corresponding positions. The color filter layer 224 is used for filtering the light passing through the light conversion layer 222, so that the color of the monochromatic light emitted from the color filter layer 224 is more pure, thereby maintaining its own monochromaticity.

The black matrix layer 226 can reduce the light interference of different colors between the pixel units, that is, prevent color mixing between adjacent pixel units, so that the liquid crystal device can produce visual effects of high contrast and high color rendering. Since the light conversion layer 222 and the color filter layer 224 are formed in the gap of the black matrix layer 226, that is, the thickness of the black matrix layer 226 is different from the thickness of the light conversion layer 222 and the color filter layer. 224 The sum of the thicknesses of the two is equal.

The transparent substrate 228 can be made of glass, a transparent inorganic substrate, or a plastic film, such as a polyethylene terephthalate (PET) film. The light emitted from the color filter layer 224 is emitted after passing through the transparent substrate.

Please refer to FIGS. 2 to 4 , which are diagrams showing the relationship between the wavelength λ and the intensity I of the light emitted by the light emitting diode 12 after passing through the backlight module 10 and the liquid crystal module 20 . That is, after the light passes through the color filter layer 224, the wavelength λ is between 525 and 650 nm; the overlapping area of the green light and the blue light is between 550 nm and 640 nm, and the overlapping area of the wavelength is less than 100 nm, which can satisfy the height of the liquid crystal display device 100. Color rendering needs.

Please refer to Figure 5, the wavelength is between 525nm and 650nm, the peak of the spectral intensity emitted by the green phosphor is at G: 529 nm; the spectral intensity emitted by the red phosphor is at R: 649 nm, the corresponding position of the intersection of the wavelength overlap region The wavelengths are: 586nm, 586-529=57 nm; 649-588=61nm), the wavelength overlap region of the spectral intensity distribution emitted by the red phosphor and the spectral intensity distribution emitted by the green phosphor is between 50 and 100 nm; the wavelength The wavelength corresponding to the intersection of the overlapping area is 586 nm, and the intensity corresponding to the 586 nm position is I=0.00038; the maximum light intensity is the light intensity corresponding to the blue light at 444 nm, and Imax=0.01619, then the light intensity of the intersection of the overlapping area is the same as the maximum light intensity. The ratio of light intensity is: I/Imax=2.35%, and the ratio is between 0% and 5%. Therefore, the liquid crystal display device provided by the present invention can meet the requirement of high color contrast.

Second Embodiment

Please refer to FIG. 2 and FIG. 3 , the liquid crystal display device provided in the second embodiment is basically the same as the liquid crystal display device 100 provided in the first embodiment, except that the second conductive substrate 22a also includes a transparent conductive layer 220, a light The conversion layer 222a, the color filter layer 224a, the black matrix layer 226a, and the transparent substrate 228. However, the light conversion layer 222a is formed in the black matrix layer 226, specifically, a plurality of gaps 223a are formed in the black matrix layer 226, and the light conversion layer 222a is formed in the gaps 223a, that is, the black matrix layer 226 is flush with the light conversion layer 222a and has the same thickness.

The color filter layer 224a includes a base layer 2242 and a color filter block 2240a formed in the base layer 2242. The color of the base layer 2242 can be transparent, and the material of the base layer 2242 can be resin or plastic. , the color filter blocks 2240a can be formed in the base layer 2242 by spraying or embossing. The color filter patches 2240a are still aligned with the fluorescent patches 2220a and the colors are in one-to-one correspondence. The color filter layer 224a covers the surface jointly formed by the black matrix layer 226a and the light conversion layer 222a.

Third Embodiment

Referring to FIG. 7 , the liquid crystal display device 300 provided by the third embodiment is basically the same as the liquid crystal display device 100 provided by the first embodiment, and the difference is that the liquid crystal display device provided by the third embodiment includes a backlight module 10a, the backlight module 10a includes a reflector 116 and a plurality of light-emitting diode chips 120 .

The light emitting diode chip 120 may be a flip chip, a micro LED chip or an RBG LED chip.

The first conductive substrate 210 includes a first surface 211 and a second surface 213 opposite to the first surface 211 . The light-emitting diode chip 120 is disposed on the first surface 211 and is electrically connected to the conductive substrate. The light emitted from the light emitting diode first enters the reflection plate 116 , is reflected by the reflection plate 116 , and then enters the first conductive substrate 210 .

In this embodiment, since the LED chip 120 is disposed on the first conductive substrate, the structure of the backlight module 10 a is more concise, and the structure of the formed liquid crystal display device 300 is thinner, which can meet the requirements of the liquid crystal display device 300 . Thinning needs.

To sum up, in the liquid crystal display devices 100 and 300 provided by the present invention, by disposing the color filter layer 224 on the light output path of the light conversion layer 222 , the color filter layer 224 is able to respond to the light of different wavelengths emitted by the light conversion layer 222 . The light is filtered, so that the outgoing light of each color maintains its own monochromaticity, and then three-color LEDs are mixed to realize color display. In this way, the obtained liquid crystal device 100 can produce high contrast and high color rendering. effect.

It should be understood that, the above embodiments are only used to illustrate the present invention, but not to limit the present invention. For those of ordinary skill in the art, other corresponding changes and modifications made according to the technical concept of the present invention all fall within the protection scope of the claims of the present invention.

Claims (10)

1. a kind of liquid crystal display device comprising: backlight module and the liquid crystal module in the backlight module optical path, it is described Liquid crystal module includes towards the first electrically-conductive backing plate of the backlight module and second electrically-conductive backing plate at the first electrically-conductive backing plate interval And the liquid crystal layer between first electrically-conductive backing plate and the second electrically-conductive backing plate is set, which is characterized in that second conductive base Plate includes the transparency conducting layer, light conversion layer and chromatic filter layer being sequentially located on the light direction of the backlight module, and The liquid crystal layer is between first electrically-conductive backing plate and the transparency conducting layer, and the light conversion layer is used for the back The light of optical mode group outgoing carries out color conversion, and the chromatic filter layer is used to carry out the light being emitted from the light conversion layer Filtering makes the light for each color being emitted from the light conversion layer remain own monochromaticjty.

2. liquid crystal display device as described in claim 1, which is characterized in that second electrically-conductive backing plate further includes transparent base Plate, the transparent substrate are the outermost layer of the liquid crystal module, and the light conversion layer and the chromatic filter layer are located at described Between transparent substrate and the transparency conducting layer.

3. liquid crystal display device as claimed in claim 2, which is characterized in that the light conversion layer is formed in the electrically conducting transparent On layer, the light conversion layer includes multiple fluorescence color lumps by certain regular repeated arrangement；The chromatic filter layer is formed in On the light conversion layer, the chromatic filter layer includes multiple optical filtering color lumps by certain regular repeated arrangement, the optical filtering color Block is corresponded with fluorescence color lump position and color.

4. liquid crystal display device as claimed in claim 3, which is characterized in that first electrically-conductive backing plate further includes black matrix" The fluorescence coating and chromatic filter layer are separated into multiple parts being spaced each other, the black square by layer, the black-matrix layer The height of battle array layer is the sum of the height of the light conversion layer and the chromatic filter layer.

5. liquid crystal display device as claimed in claim 3, which is characterized in that the light conversion layer is transparent polymer and shape At the quantum dot in transparent polymer；Or it is formed in the fluorescent powder in transparent polymer.

6. liquid crystal display device as described in claim 1, which is characterized in that the backlight module be down straight aphototropism mode set or Person's side entrance back module.

7. liquid crystal display device as claimed in claim 6, which is characterized in that the backlight module is down straight aphototropism mode set, It includes circuit board, spaced light emitting diode, setting on circuit boards is arranged on circuit boards and is located at light-emitting diodes The optical diaphragm managing out the secondary optical lens in light optical path and being arranged in front of secondary optical lens.

8. liquid crystal display device as claimed in claim 3, which is characterized in that first electrically-conductive backing plate further includes black matrix" Layer, it is multiple parts being spaced each other that the black-matrix layer, which only separates the light conversion layer, and the chromatic filter layer is covered on The surface that the black-matrix layer and the light conversion layer are collectively formed.

9. liquid crystal display device as claimed in claim 8, which is characterized in that the chromatic filter layer includes base layer, described Optical filtering color lump is formed in the base layer, and the black-matrix layer is formed on the base layer, the optical filtering color lump with The fluorescence color lump alignment and color one-to-one correspondence.

10. a kind of liquid crystal display device comprising: backlight module and the liquid crystal module in the backlight module optical path；

The backlight module includes reflecting plate and light-emitting diode chip for backlight unit；

The liquid crystal module includes to lead towards the first electrically-conductive backing plate of the reflecting plate, with the second of the first electrically-conductive backing plate interval Electric substrate and the liquid crystal layer being arranged between first electrically-conductive backing plate and the second electrically-conductive backing plate；The light-emitting diode chip for backlight unit is set It sets in first electrically-conductive backing plate towards on the surface of the reflecting plate；Second electrically-conductive backing plate includes being sequentially located at the back Transparency conducting layer, light conversion layer and chromatic filter layer on the light direction of optical mode group, and the liquid crystal layer is positioned at described Between first electrically-conductive backing plate and the transparency conducting layer；The light that the light conversion layer is used to be emitted the backlight module carries out Color conversion, the chromatic filter layer make to convert from the light for being filtered the light being emitted from the light conversion layer The light of each color of layer outgoing remains own monochromaticjty.