CN213750389U - Light guide plate, backlight module with same and liquid crystal display device - Google Patents
Light guide plate, backlight module with same and liquid crystal display device Download PDFInfo
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- CN213750389U CN213750389U CN202022453986.1U CN202022453986U CN213750389U CN 213750389 U CN213750389 U CN 213750389U CN 202022453986 U CN202022453986 U CN 202022453986U CN 213750389 U CN213750389 U CN 213750389U
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Abstract
The utility model discloses a light guide plate and have its backlight unit, liquid crystal display device. The light guide plate comprises a first substrate, a second substrate and a light guide layer arranged between the first substrate and the second substrate, wherein the surface, close to the first substrate, of the light guide layer is provided with holes which are arranged in an array mode, and quantum dots are filled in the holes. The quantum dots comprise red quantum dots, blue quantum dots and green quantum dots, the blue quantum dots are positioned between the red quantum dots and the green quantum dots, and the quantum dots positioned on the same row or the same column are consistent in color. The utility model provides a light that the light guide plate sent the LED light source passes through the transmission of light guiding layer, at light guiding layer upper surface trompil, fixes quantum dot in the trompil, and quantum dot can give out light under the excitation of light, chooses for use the quantum dot that can arouse blue red green, puts together red blue green's quantum dot, obtains white light like this by pure blue pure green pure red synthetic, and such light is very pure, can promote backlight unit's colour gamut.
Description
Technical Field
The utility model belongs to the technical field of show, concretely relates to light guide plate and have its backlight unit, liquid crystal display device.
Background
Quantum dots are nanoscale crystals composed of semiconductor materials. Compared with fluorescent particles, the quantum dot nano material has many advantages, such as that quantum dots can generate denser light in a narrower wavelength band, have high stability, have excellent fluorescence emission property in a visible light region, have continuous distribution of an excitation spectrum, and have the position of a fluorescence peak which can be regulated and controlled along with the physical size of the fluorescence peak.
Liquid crystal displays have become the mainstream product in the display field today. Since the liquid crystal panel itself does not emit light, a backlight module is required to provide a light source. At present, three types of white light LEDs are mainly applied to the backlight module, firstly, the LED units form white light by mixing three primary colors of LED light sources, and the mode is high in cost and difficult to control; secondly, the blue light LED excites the yellow fluorescent powder to mix into white light, and the chip and the fluorescent powder layer are usually packaged together in the mode, so that the problems of heat dissipation, low luminous efficiency and the like exist; and thirdly, exciting the quantum dots emitting red light and green light by the blue LED, and mixing the three colors of light into white light. The quantum dots are dispersed on the film and packaged in the backlight module, for example, the white light source is obtained by coating a quantum dot film on the light guide plate. The quantum dot film is far away from the LED, and the temperature is low, however, the quantum dot using amount is large and the cost is high. The longer the path of the light in the light guide plate, the lower the transmittance and the lower the efficiency.
The color gamut (NTSC) of the current backlight module is low, and cannot present richer and more gorgeous colors. The red and green quantum dot films are obtained by curing the mixed green quantum dots and red quantum dots in glue, and the LED is used as a backlight source in a matching way, so that a display scheme with a higher color gamut can be obtained. However, by adopting the scheme, green light emitted by blue light absorbed by green quantum dots in the red and green quantum dot film can be absorbed by the red quantum dots, and the luminous efficiency of the green quantum dots is reduced, so that the luminous efficiency of the whole backlight module is reduced. Meanwhile, the green quantum dots and the red quantum dots have different reliabilities, so that subsequent green attenuation or red attenuation is faster, a larger color point deviation is generated, and the color development life of the backlight module is influenced.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the utility model provides a light guide plate and have its backlight unit, liquid crystal display device improves backlight unit's colour gamut and improves the life in a poor light, for realizing above-mentioned purpose, the utility model discloses a following technical scheme:
the light guide plate comprises a first substrate, a second substrate and a light guide layer arranged between the first substrate and the second substrate, wherein the surface, close to the first substrate, of the light guide layer is provided with holes arranged in an array mode, and the holes are filled with quantum dots.
Further, a light guide structure is arranged on the light emitting surface of the first substrate, the center line of the first substrate is taken as an axis, and the size of the light guide structure is gradually reduced and the concentration density of the light guide structure is also gradually reduced in directions of two sides far away from the axis.
Further, the light guide structure is any one or a combination of more than two of a spherical light guide dot, a conical light guide dot and a columnar light guide dot.
Furthermore, the light guide structure is a spherical light guide dot, and the spherical diameter of the spherical light guide dot positioned at the axis is larger than that of the spherical light guide dot far away from the axis.
Furthermore, the quantum dots comprise red quantum dots, blue quantum dots and green quantum dots, the blue quantum dots are positioned between the red quantum dots and the green quantum dots, and the quantum dots positioned on the same row or the same column are consistent in color.
Further, the red quantum dots, the blue quantum dots and the green quantum dots constitute one sub-unit, and a plurality of the sub-units are arrayed on the light guide layer.
Further, the light guide layer is a fiber optic layer.
The utility model provides a backlight module, still include the LED light source and as above the light guide plate, the LED light source is located the income light side of light guide plate.
Further, the LED light source is a blue LED light source.
The utility model provides a liquid crystal display device, including liquid crystal display panel and as above backlight unit, liquid crystal display panel arranges in on backlight unit's the play plain noodles.
The utility model has the advantages that: under a certain electric field or light pressure, the quantum dots can emit light with a specific frequency, and the frequency of the emitted light can change along with the change of the size of the semiconductor, so that the color of the emitted light can be controlled by adjusting the size of the nano semiconductor. The light that sends LED passes through the transmission of light guiding layer, at light guiding layer upper surface trompil, fixes quantum dot in the trompil, and quantum dot can give out light under the excitation of light, chooses for use to excite the quantum dot of red bluish green, puts together the quantum dot of red bluish green, obtains white light like this and is synthesized by pure green pure red of pure blue, and such light is very pure, can promote backlight unit's colour gamut. The blue light quantum dots are placed in the middle of the red and green light quantum dots, so that green light excited by the green light quantum dots is prevented from being absorbed by the red light quantum dots, the light emitting efficiency of backlight is improved, and the service life of the backlight is prolonged.
Drawings
FIG. 1 is a schematic view of a longitudinal cross-sectional structure of a light guide plate according to the present invention;
FIG. 2 is a schematic view of a top view of the light guide plate of the present invention;
fig. 3 is a schematic diagram of the light guide dot arrangement structure on the light emitting surface of the light guide plate of the present invention.
In the figure:
10-a light guide plate;
11-a first substrate, 12-a second substrate, 13-a light-emitting surface, 14-a light guide structure, 15-a light-incident side;
2-a light-guiding layer;
3-quantum dots, 31-red quantum dots, 32-blue quantum dots, 33-green quantum dots;
4-LED light source.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. Moreover, certain well-known elements may not be shown in the figures. Numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of components, are set forth in the following description in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.
Example one
FIG. 1 is a schematic view of a longitudinal cross-sectional structure of a light guide plate according to the present invention; FIG. 2 is a schematic view of a top view of the light guide plate of the present invention; fig. 3 is a schematic diagram of the light guide dot arrangement structure on the light emitting surface of the light guide plate of the present invention.
As shown in fig. 1 to 3, the present invention provides a light guide plate 10, the light guide plate 10 includes a first substrate 11, a second substrate 12, and a light guide layer 2 disposed between the first substrate 11 and the second substrate 12. The side of the first substrate 11 away from the light guiding layer 2 is a light emitting surface 13, and the light emitting surface 13 is made into a frosted surface, so that the frosted structure can reduce the light emission. The light emitting surface 13 is further provided with a light guide structure 14, and the light guide structure 14 is gradually reduced in size and the concentration density of the light guide structure 14 in the directions away from the axis by taking the long-side center line of the first substrate 11 as the axis or the short-side center line of the first substrate 11 as the axis. The light guide structure 14 is any one of or a combination of two or more of a spherical light guide dot, a conical light guide dot, and a columnar light guide dot. In the present embodiment, the light guide structure 14 is taken as a spherical light guide dot for illustration, but the invention is not limited thereto. As shown in fig. 3, the central line of the long side of the first substrate 11 is used as an axis, the spherical diameter of the spherical light guide dots of the light guide structure 14 located at the axis of the first substrate 11 is greater than the spherical diameter of the spherical light guide dots far away from the axis, the spherical diameter of the light guide dots at the axis is the largest, the light guide dots are closely arranged, in the directions of two sides far away from the axis, the spherical diameter of the light guide dots is gradually reduced, and the arrangement of the light guide dots is sparse, and by arranging the light guide dots and the frosted structure on the light emitting surface 13 of the first substrate 11 of the light guide plate 10, the light passing through the light guide plate 10 is favorably and uniformly emitted out of the light guide plate 10, which is favorable for improving the uniformity of the light of the backlight module. The light throughput of the light guide mesh points with large size is large, the light throughput of the light guide mesh points with small size is small, and the frosted structure can reduce the light emission, so that the light can be uniformly emitted through the arrangement of the light guide mesh points and the frosted framework.
The surface of the light guide layer 2 close to the first substrate 11 is provided with openings (not shown in the figure) arranged in an array, the quantum dots 3 are filled in the openings, and the quantum dots 3 include red quantum dots 31, blue quantum dots 32 and green quantum dots 33. The color of the quantum dots 3 in the same row or the same example is consistent, and the color of the quantum dots 3 in the same row is exemplified in the present embodiment, but the present invention is not limited thereto. The blue quantum dots 32 are located between the red quantum dots 31 and the green quantum dots 33. As shown in fig. 2, the first row is a red quantum dot 31, the second row is a blue quantum dot 32, and the third row is a green quantum dot 33, and one red quantum dot 31, one blue quantum dot 32, and one green quantum dot 33 constitute one sub-unit, and a plurality of sub-units are arranged in an array on the light guide layer 2. In the present embodiment, the optical guiding layer 2 may be an optical fiber layer, but the present invention is not limited thereto.
The quantum dots 3 emit light of a specific frequency under a certain electric field or light pressure, and the frequency of the emitted light changes with the change of the size of the semiconductor, so that the color of the emitted light can be controlled by adjusting the size of the nano semiconductor. The light that sends the LED light source passes through the transmission of light guide layer, at light guide layer upper surface trompil, fixes quantum dot in the trompil, and quantum dot 3 can be luminous under the excitation of light, chooses for use to excite the quantum dot that reddish-blue-green, puts together the quantum dot of reddish-blue-green, and it is synthetic by pure blue pure green pure red to obtain white light like this, and such light is very pure, can promote backlight unit's colour gamut. When the quantum dots 3 are arranged, the blue quantum dots 32 are placed between the red quantum dots 31 and the green quantum dots 33, so that green light excited by the green quantum dots 33 is prevented from being absorbed by the red quantum dots 31, the backlight luminous efficiency is improved, and the service life of the backlight module is prolonged.
The utility model provides a backlight module, including LED light source 4 and foretell light guide plate 10, LED light source 4 is located the income light side 15 of light guide plate 10, and in this embodiment, the blue LED light source is preferred to LED light source 4, the utility model discloses do not be limited to this.
The utility model also provides a liquid crystal display device includes liquid crystal display panel and foretell backlight unit, and display panel installs on backlight unit's play plain noodles.
The utility model has the advantages that: the color gamut of the backlight module is improved by improving the backlight luminous purity; the problem of reduction of backlight luminous efficiency caused by absorption of green light emitted by green quantum dots by red quantum dots in the traditional color gamut improving method is solved; the backlight lifetime in the conventional method is improved.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with the preferred embodiment, it is not limited to the present invention, and any skilled person can make modifications or changes equivalent to the above embodiments without departing from the scope of the present invention, but all the modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are within the scope of the present invention.
Claims (10)
1. The light guide plate is characterized by comprising a first substrate, a second substrate and a light guide layer arranged between the first substrate and the second substrate, wherein the surface, close to the first substrate, of the light guide layer is provided with holes distributed in an array mode, and the holes are filled with quantum dots.
2. The light guide plate according to claim 1, wherein a light guide structure is disposed on the light emitting surface of the first substrate, and the light guide structure has a gradually decreasing size and a gradually decreasing distribution density in directions away from the axis and on both sides of the axis along the central line of the first substrate.
3. The light guide plate according to claim 2, wherein the light guide structure is any one or a combination of two or more of a spherical light guide dot, a conical light guide dot, and a columnar light guide dot.
4. The light guide plate according to claim 3, wherein the light guide structure is a spherical light guide dot, and the spherical diameter of the spherical light guide dot located at the axis is larger than that of the spherical light guide dot located away from the axis.
5. The light guide plate according to claim 1, wherein the quantum dots comprise red quantum dots, blue quantum dots and green quantum dots, the blue quantum dots are positioned between the red quantum dots and the green quantum dots, and the quantum dots positioned in the same row or the same column are consistent in color.
6. The light guide plate of claim 5, wherein the red quantum dots, the blue quantum dots, and the green quantum dots form a sub-unit, and a plurality of the sub-units are arrayed on the light guide layer.
7. The light guide plate according to claim 1, wherein the light guide layer is a fiber optic layer.
8. A backlight module, further comprising an LED light source and the light guide plate according to any one of claims 1 to 7, wherein the LED light source is located at the light incident side of the light guide plate.
9. The backlight module according to claim 8, wherein the LED light source is a blue LED light source.
10. A liquid crystal display device comprising a liquid crystal display panel and the backlight module according to any one of claims 8-9, wherein the liquid crystal display panel is disposed on the light-emitting side of the backlight module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022453986.1U CN213750389U (en) | 2020-10-29 | 2020-10-29 | Light guide plate, backlight module with same and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022453986.1U CN213750389U (en) | 2020-10-29 | 2020-10-29 | Light guide plate, backlight module with same and liquid crystal display device |
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| Publication Number | Publication Date |
|---|---|
| CN213750389U true CN213750389U (en) | 2021-07-20 |
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| CN202022453986.1U Active CN213750389U (en) | 2020-10-29 | 2020-10-29 | Light guide plate, backlight module with same and liquid crystal display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115113435A (en) * | 2022-06-08 | 2022-09-27 | Tcl华星光电技术有限公司 | Backlight module and display device |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115113435A (en) * | 2022-06-08 | 2022-09-27 | Tcl华星光电技术有限公司 | Backlight module and display device |
| CN115113435B (en) * | 2022-06-08 | 2023-11-28 | Tcl华星光电技术有限公司 | Backlight module and display device |
| WO2023236266A1 (en) * | 2022-06-08 | 2023-12-14 | 惠州华星光电显示有限公司 | Backlight module and display device |
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