CN109375421B - Liquid crystal display device with a light guide plate - Google Patents
Liquid crystal display device with a light guide plate Download PDFInfo
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- CN109375421B CN109375421B CN201811566987.8A CN201811566987A CN109375421B CN 109375421 B CN109375421 B CN 109375421B CN 201811566987 A CN201811566987 A CN 201811566987A CN 109375421 B CN109375421 B CN 109375421B
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- quantum dot
- liquid crystal
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides a liquid crystal display. The liquid crystal display comprises a backlight module and a liquid crystal display panel arranged on the backlight module; the backlight module comprises a light source, a quantum dot film arranged on the light source, a diffusion layer arranged on the quantum dot film and a brightness enhancement film arranged on the diffusion layer, wherein the light emitting angle of the quantum dot film is larger than that of the light emitting source, so that after light rays emitted by the light source pass through the quantum dot film and excite the quantum dot to convert the light rays into white light, the light emitting visual angle is increased, the display effect of the backlight module is improved, and the OD value of the backlight module is reduced; in addition, when the white light reaches the brightness enhancement film after passing through the diffusion layer and being uniformly distributed, the brightness enhancement film can reflect part of light to the quantum dot film, the quantum dots are excited again to form the white light, the luminous efficiency of the quantum dots is improved, and the display effect of the backlight module can be further improved by the white light excited again.
Description
Technical Field
The invention relates to the technical field of display, in particular to a liquid crystal display.
Background
Thin Film Transistors (TFTs) are the main driving elements in current Liquid Crystal Displays (LCDs) and Active Matrix Organic electroluminescent displays (AMOLEDs), and are directly related to the Display performance of flat panel displays.
Most of the existing liquid crystal displays in the market are backlight liquid crystal displays (lcds), which include a liquid crystal display panel and a backlight module (backlight module). The liquid crystal display panel operates on the principle that liquid crystal molecules are poured between a Thin Film Transistor Array Substrate (TFT Array Substrate) and a Color Filter (CF) Substrate, pixel voltage and common voltage are applied to the two substrates, and the rotation direction of the liquid crystal molecules is controlled by an electric field formed between the pixel voltage and the common voltage, so that light of a backlight module is transmitted out to generate a picture.
Since the lcd panel does not emit light, the backlight module is one of the key components of the lcd device because the backlight module needs to provide a light source to normally display images. The backlight module is divided into a side-in type backlight module and a direct type backlight module according to different incident positions of the light source. In the direct type backlight module, a backlight source such as a Cathode Fluorescent Lamp (CCFL) or a Light Emitting Diode (LED) Light source is disposed behind a liquid crystal panel, and Light is homogenized by a diffuser plate to form a surface Light source for the liquid crystal panel.
The direct type backlight module has the advantages of high cost performance, good optical stability and the like. The current backlight type liquid crystal display generally adopts a direct type backlight module, but the light mixing Distance (OD) value of the direct type backlight module is generally larger (the height from a backlight module circuit board to a diffusion plate is called as the light mixing height), so that the whole thickness of the liquid crystal display is thicker, in addition, a small OD value scheme of a lens scheme is adopted for part of the liquid crystal display, but the current OD value can only be near 10mm, and if the OD value of the backlight module is further reduced, the difficulty is higher.
Disclosure of Invention
The invention aims to provide a liquid crystal display, which can improve the display effect of a backlight module and reduce the OD value of the backlight module.
To achieve the above object, the present invention provides a liquid crystal display comprising: the backlight module comprises a backlight module and a liquid crystal display panel arranged on the backlight module;
the backlight module comprises a light source, a quantum dot film arranged on the light source, a diffusion layer arranged on the quantum dot film and a brightness enhancement film arranged on the diffusion layer;
the light-emitting angle of the quantum dot film is larger than that of the light-emitting source.
The luminous source comprises a printed circuit board and a plurality of light emitting diodes which are arranged on the printed circuit board and distributed in an array.
The light emitting diode is a flip blue light emitting diode.
The distance between the upper surfaces of the plurality of light emitting diodes and the lower surface of the quantum dot film is smaller than 1mm and larger than 0 mm.
The distance between the upper surface of the quantum dot film and the lower surface of the brightness enhancement film is larger than 1mm and smaller than 50 mm.
The brightness enhancement film is a reflective polarizer.
The diffusion layer is a diffusion plate; the brightness enhancement film is attached to the upper surface of the diffusion layer; the upper surface of the quantum dot film is attached to the lower surface of the diffusion layer;
the thickness of the diffusion layer is greater than 1mm and less than 50 mm.
The upper surfaces of the light-emitting diodes are all provided with packaging glue, and the lower surfaces of the quantum dot films are attached to the upper surfaces of the light-emitting diodes through the packaging glue.
The diffusion layer is a diffusion film or a micro-lens film; the upper surface of the brightness enhancement film is attached to the lower surface of the liquid crystal display panel, and the lower surface of the brightness enhancement film is attached to the upper surface of the diffusion layer.
The upper surfaces of the light-emitting diodes are all provided with packaging glue, and the lower surfaces of the quantum dot films are attached to the upper surfaces of the light-emitting diodes through the packaging glue;
the distance between the upper surface of the quantum dot film and the lower surface of the diffusion layer is larger than 1mm and smaller than 50 mm.
The invention has the beneficial effects that: the liquid crystal display comprises a backlight module and a liquid crystal display panel arranged on the backlight module; the backlight module comprises a light source, a quantum dot film arranged on the light source, a diffusion layer arranged on the quantum dot film and a brightness enhancement film arranged on the diffusion layer, wherein the light emitting angle of the quantum dot film is larger than that of the light emitting source, so that after light rays emitted by the light source pass through the quantum dot film and excite the quantum dot to convert the light rays into white light, the light emitting visual angle is increased, the display effect of the backlight module is improved, and the OD value of the backlight module is reduced; in addition, when the white light reaches the brightness enhancement film after passing through the diffusion layer and being uniformly distributed, the brightness enhancement film can reflect part of light to the quantum dot film, the quantum dots are excited again to form the white light, the luminous efficiency of the quantum dots is improved, and the display effect of the backlight module can be further improved by the white light excited again.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of a light path of a backlight module of a liquid crystal display according to the present invention;
FIG. 2 is a graph showing the relationship between the brightness and the viewing angle of a quantum dot film of an LCD according to the present invention;
FIG. 3 is a schematic diagram of a liquid crystal display according to a first embodiment of the invention;
FIG. 4 is a diagram of a second embodiment of a liquid crystal display according to the invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 1 to 4, the present invention provides a liquid crystal display, including: the backlight module 10 and the liquid crystal display panel 20 arranged on the backlight module 10;
the backlight module 10 comprises a light source 11, a quantum dot film 12 arranged on the light source 11, a diffusion layer 13 arranged on the quantum dot film 12, and a brightness enhancement film 14 arranged on the diffusion layer 13;
the light emitting angle of the quantum dot thin film 12 is larger than that of the light emitting source 11.
It should be noted that the backlight module 10 of the liquid crystal display of the present invention includes a light source 11, a quantum dot film 12 disposed on the light source 11, a diffusion layer 13 disposed on the quantum dot film 12, and a brightness enhancement film 14 disposed on the diffusion layer 13, please refer to fig. 2, where the light emitting viewing angle of the quantum dot film 12 is better than the light emitting viewing angle of the light source 11 (the viewing angle of one third of the brightness of the quantum dot film 12 is greater than 140 degrees, and the viewing angle distribution is close to lambertian illuminant), that is, the light emitting angle of the quantum dot film 12 is greater than the light emitting angle of the light source 11, so that after the light emitted by the light source 11 passes through the quantum dot film 12, the light emitting viewing angle is increased to excite the quantum dot to convert the light into white light, which is beneficial to improving the display effect of the backlight module 10 and reducing the OD value of the backlight module; in addition, when the white light uniformly distributed by the diffusion layer 13 reaches the brightness enhancement film 14, the brightness enhancement film 14 reflects part of the light to the quantum dot film 12, and the quantum dots are excited again to form the white light, so that the light emitting efficiency of the quantum dots is improved, and the display effect of the backlight module 10 can be further improved by the excited white light.
Specifically, the light source 11 includes a printed circuit board 111 and a plurality of light emitting diodes 112 arranged on the printed circuit board 111 in an array.
Further, the light emitting diode 112 is a flip-chip blue light emitting diode.
Specifically, the distance between the upper surfaces of the plurality of light emitting diodes 112 and the lower surface of the quantum dot thin film 12 is less than 1mm and greater than 0 mm.
Specifically, the distance between the upper surface of the quantum dot film 12 and the lower surface of the brightness enhancement film 14 is greater than 1mm and less than 50 mm.
Specifically, the brightness enhancement film 14 is a Dual Brightness Enhancement Film (DBEF).
Specifically, referring to fig. 3, in the first embodiment of the liquid crystal display according to the present invention, the diffusion layer 13 is a diffusion plate; the brightness enhancement film 14 is attached to the upper surface of the diffusion layer 13; the upper surface of the quantum dot film 12 is attached to the lower surface of the diffusion layer 13, namely the quantum dot film 12, the diffusion layer 13 and the brightness enhancement film 14 are attached together in a three-in-one manner. The thickness of the diffuser plate is greater than 1mm and less than 50 mm.
Further, the upper surfaces of the light emitting diodes 112 are all provided with packaging glue 113, and the lower surface of the quantum dot film 12 is also attached to the upper surfaces of the light emitting diodes 112 through the packaging glue 113.
Specifically, referring to fig. 4, in a second embodiment of the liquid crystal display according to the present invention, the diffusion layer 13 is a diffusion film or a microlens film; the upper surface of the brightness enhancement film 14 is attached to the lower surface of the liquid crystal display panel 20, and the lower surface of the brightness enhancement film 14 is attached to the upper surface of the diffusion layer 13; namely, the diffusion layer 13, the brightness enhancement film 14 and the liquid crystal display panel are adhered together in a three-in-one manner.
Further, the upper surfaces of the light emitting diodes 112 are all provided with packaging glue 113, and the lower surface of the quantum dot film 12 is attached to the upper surfaces of the light emitting diodes 112 through the packaging glue 113;
the distance between the upper surface of the quantum dot thin film 12 and the lower surface of the diffusion layer 13 is greater than 1mm and less than 50 mm. That is, the distance of more than 1mm and less than 50mm is realized by an air layer having a thickness of more than 1mm and less than 50mm between the quantum dot thin film 12 and the diffusion layer 13.
In summary, the liquid crystal display of the present invention includes a backlight module and a liquid crystal display panel disposed on the backlight module; the backlight module comprises a light source, a quantum dot film arranged on the light source, a diffusion layer arranged on the quantum dot film and a brightness enhancement film arranged on the diffusion layer, wherein the light emitting angle of the quantum dot film is larger than that of the light emitting source, so that after light rays emitted by the light source pass through the quantum dot film and excite the quantum dot to convert the light rays into white light, the light emitting visual angle is increased, the display effect of the backlight module is improved, and the OD value of the backlight module is reduced; in addition, when the white light reaches the brightness enhancement film after passing through the diffusion layer and being uniformly distributed, the brightness enhancement film can reflect part of light to the quantum dot film, the quantum dots are excited again to form the white light, the luminous efficiency of the quantum dots is improved, and the display effect of the backlight module can be further improved by the white light excited again.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (7)
1. A liquid crystal display, comprising: the backlight module comprises a backlight module (10) and a liquid crystal display panel (20) arranged on the backlight module (10);
the backlight module (10) comprises a light emitting source (11), a quantum dot film (12) arranged on the light emitting source (11), a diffusion layer (13) arranged on the quantum dot film (12) and a brightness enhancement film (14) arranged on the diffusion layer (13);
the light-emitting angle of the quantum dot film (12) is larger than that of the light-emitting source (11);
the light emitting source (11) comprises a printed circuit board (111) and a plurality of light emitting diodes (112) which are arranged on the printed circuit board (111) and distributed in an array;
the distance between the upper surfaces of the plurality of light emitting diodes (112) and the lower surface of the quantum dot film (12) is less than 1mm and greater than 0 mm;
the distance between the upper surface of the quantum dot film (12) and the lower surface of the brightness enhancement film (14) is larger than 1mm and smaller than 50 mm.
2. The liquid crystal display of claim 1, wherein the light emitting diode (112) is a flip-chip blue light emitting diode.
3. The liquid crystal display of claim 1, wherein the brightness enhancing film (14) is a reflective polarizer.
4. The liquid crystal display of claim 1, wherein the diffusion layer (13) is a diffusion plate; the brightness enhancement film (14) is attached to the upper surface of the diffusion layer (13); the upper surface of the quantum dot film (12) is attached to the lower surface of the diffusion layer (13);
the thickness of the diffusion layer (13) is greater than 1mm and less than 50 mm.
5. The liquid crystal display of claim 4, wherein the upper surfaces of the plurality of light emitting diodes (112) are provided with packaging glue (113), and the lower surface of the quantum dot film (12) is further attached to the upper surfaces of the plurality of light emitting diodes (112) by the packaging glue (113).
6. The liquid crystal display of claim 1, wherein the diffusion layer (13) is a diffusion film or a microlens film; the upper surface of the brightness enhancement film (14) is attached to the lower surface of the liquid crystal display panel (20), and the lower surface of the brightness enhancement film (14) is attached to the upper surface of the diffusion layer (13).
7. The liquid crystal display of claim 6, wherein the upper surfaces of the plurality of light emitting diodes (112) are all provided with packaging glue (113), and the lower surfaces of the quantum dot films (12) are attached to the upper surfaces of the plurality of light emitting diodes (112) through the packaging glue (113);
the distance between the upper surface of the quantum dot film (12) and the lower surface of the diffusion layer (13) is larger than 1mm and smaller than 50 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811566987.8A CN109375421B (en) | 2018-12-19 | 2018-12-19 | Liquid crystal display device with a light guide plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811566987.8A CN109375421B (en) | 2018-12-19 | 2018-12-19 | Liquid crystal display device with a light guide plate |
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| CN109375421A CN109375421A (en) | 2019-02-22 |
| CN109375421B true CN109375421B (en) | 2021-08-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113257113A (en) * | 2020-02-13 | 2021-08-13 | 群创光电股份有限公司 | Optical device |
| CN113689784A (en) * | 2021-09-01 | 2021-11-23 | 广东瑞捷光电股份有限公司 | High-brightness quantum dot diffusion plate structure and manufacturing process thereof |
| CN114167647A (en) * | 2021-12-08 | 2022-03-11 | 常州亚玛顿股份有限公司 | Direct type liquid crystal display and direct type liquid crystal television |
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| CN103672609A (en) * | 2013-12-02 | 2014-03-26 | 深圳市华星光电技术有限公司 | Light source with quantum dots and manufacturing method and application of light source with quantum dots |
| CN105372878A (en) * | 2015-12-04 | 2016-03-02 | 青岛海信电器股份有限公司 | Quantum dot luminescent device, backlight module and display device |
| CN206906757U (en) * | 2017-06-16 | 2018-01-19 | 深圳Tcl新技术有限公司 | Compound film sheet, backlight module and display device |
| CN108169837A (en) * | 2018-01-16 | 2018-06-15 | 惠州市华星光电技术有限公司 | Liquid crystal display and its polaroid |
| CN108508654A (en) * | 2018-04-08 | 2018-09-07 | 青岛海信电器股份有限公司 | A kind of backlight module and liquid crystal display device |
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| US10551670B2 (en) * | 2015-01-05 | 2020-02-04 | Samsung Display Co., Ltd. | Liquid crystal display with improved color reproducibility |
| JP6634685B2 (en) * | 2015-03-03 | 2020-01-22 | 大日本印刷株式会社 | Image display device |
| CN105334660A (en) * | 2015-12-08 | 2016-02-17 | 深圳市华星光电技术有限公司 | Quantum dot polaroid |
| CN106058015B (en) * | 2016-06-16 | 2019-02-26 | 青岛海信电器股份有限公司 | Quantum dot light emitting device, backlight module and liquid crystal display device |
| CN107255889A (en) * | 2017-08-09 | 2017-10-17 | 青岛海信电器股份有限公司 | A kind of liquid crystal display device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103672609A (en) * | 2013-12-02 | 2014-03-26 | 深圳市华星光电技术有限公司 | Light source with quantum dots and manufacturing method and application of light source with quantum dots |
| CN105372878A (en) * | 2015-12-04 | 2016-03-02 | 青岛海信电器股份有限公司 | Quantum dot luminescent device, backlight module and display device |
| CN206906757U (en) * | 2017-06-16 | 2018-01-19 | 深圳Tcl新技术有限公司 | Compound film sheet, backlight module and display device |
| CN108169837A (en) * | 2018-01-16 | 2018-06-15 | 惠州市华星光电技术有限公司 | Liquid crystal display and its polaroid |
| CN108508654A (en) * | 2018-04-08 | 2018-09-07 | 青岛海信电器股份有限公司 | A kind of backlight module and liquid crystal display device |
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