CN114815385A - Display device and backlight module thereof - Google Patents
Display device and backlight module thereof Download PDFInfo
- Publication number
- CN114815385A CN114815385A CN202210295603.3A CN202210295603A CN114815385A CN 114815385 A CN114815385 A CN 114815385A CN 202210295603 A CN202210295603 A CN 202210295603A CN 114815385 A CN114815385 A CN 114815385A
- Authority
- CN
- China
- Prior art keywords
- light
- plate
- polarized light
- semi
- wave plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005282 brightening Methods 0.000 claims abstract description 32
- 239000012528 membrane Substances 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 239000004973 liquid crystal related substance Substances 0.000 claims description 31
- 238000009792 diffusion process Methods 0.000 claims description 20
- 238000007747 plating Methods 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000011084 recovery Methods 0.000 abstract description 15
- 230000035772 mutation Effects 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 47
- 238000010586 diagram Methods 0.000 description 16
- 239000000758 substrate Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000010287 polarization Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000004064 recycling Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000002346 layers by function Substances 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004383 yellowing Methods 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- 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
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- 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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
-
- 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
- G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
The application provides a display device and a backlight module thereof, wherein the backlight module comprises a light source, a light-transmitting plate, a reflecting type polarized light brightening membrane and an 1/4 wave plate; the reflector plate is arranged on one side of the light-transmitting plate; the reflective polarized light brightening membrane is arranged on the other side of the light-transmitting plate; 1/4 the wave plate and the light-transmitting plate are arranged on the same side of the reflection type polarized light brightening membrane. According to the application, the 1/4 wave plate is arranged on one side, provided with the light transmission plate, of the reflection type polarized light brightening membrane, the polarized light which is reflected by the reflection type polarized light brightening membrane and does not penetrate through the light transmission plate passes through the 1/4 wave plate and then becomes circularly polarized light, the phase mutation occurs through reflection of the reflection plate, and after passing through the 1/4 wave plate, the polarized light which can penetrate through the reflection type polarized light brightening membrane can be converted into the polarized light, so that the backlight recovery efficiency is improved, and the display quality of the display panel is improved; and the passing times of the backlight generated by the light source in the reflection type polarized light brightness enhancement film is reduced, and the phenomenon that the recycled backlight light is yellow is further avoided.
Description
Technical Field
The present application relates to a display device, and more particularly, to a display device and a backlight module thereof.
Background
The backlight module is one of the important components of the liquid crystal display, and because the liquid crystal does not emit light, the backlight module has the function of supplying sufficient light sources with uniform brightness and distribution, so that the liquid crystal display can normally display images. At present, the display technology of the liquid crystal display is mature, and especially, the design of the backlight module is greatly developed. The backlight module can be applied to liquid crystal display devices such as liquid crystal displays and liquid crystal televisions, and can also provide light sources for display devices such as digital photo frames, electronic paper and mobile phones.
The backlight of an LCD (Liquid Crystal Display) is a natural light source, and natural light loses more than half of its energy after passing through a lower polarizer of the LCD. In order to improve the display brightness of the LCD, the energy in the vibration direction absorbed by the lower polarizer is reflected back to the backlight system by using the reflective polarized light brightening template, and is changed into natural light again after multiple reflections, and then the energy loss part is reused after multiple reflection conversion by screening the reflective polarized light brightening template. But in the process of multiple reflection conversion and screening, the brightness of the backlight can be gradually absorbed, so that the brightness of the backlight is reduced; and the recycled light passes through the reflective polarizing brightness enhancement module multiple times, causing the problem of excessive yellowing of the backlight.
Disclosure of Invention
The technical problem that this application mainly solved provides a display device and backlight unit thereof to solve among the prior art that the recovery efficiency is low just to have the problem of retrieving light yellow partially.
In order to solve the above technical problem, the first technical solution adopted by the present application is: provided is a backlight module, including: a light source; a light-transmitting plate; the reflecting sheet is arranged on one side of the light-transmitting plate; the reflective polarized light brightening membrane is arranged on the other side of the light-transmitting plate; the reflective polarized light brightness enhancement film further comprises an 1/4 wave plate, wherein the 1/4 wave plate and the light-transmitting plate are arranged on the same side of the reflective polarized light brightness enhancement film.
The 1/4 wave plate is arranged between the reflective polarized light brightness enhancement film and the light-transmitting plate; the light transmitting plate is a light guide plate, and the light source is of a side-in type and is arranged on the side surface of the light guide plate; or the light source is in a direct type and is arranged on one side, far away from the 1/4 wave plate, of the light-transmitting plate.
The light transmitting plate is a light guide plate, and the light source is of a side-in type and is arranged on the side face of the light guide plate; the backlight module also comprises a semi-transparent and semi-reflective layer arranged between the light guide plate and the 1/4 wave plate.
The semi-transparent and semi-reflective layer is a plating layer arranged on the surface of the light guide plate close to the 1/4 wave plate; or, the semi-transparent and semi-reflective layer is a plating layer arranged on the surface of the 1/4 wave plate close to the light guide plate; or, the semi-transparent semi-reflecting layer is an independent membrane.
The light source is a direct type light source and is arranged on one side of the light transmission plate far away from the 1/4 wave plate, and the light transmission plate is a transparent support plate or a diffusion plate.
Wherein, the light-transmitting plate is a diffusion plate; the backlight module also comprises a semi-transparent and semi-reflective layer arranged between the diffusion plate and the 1/4 wave plate.
The semi-transparent and semi-reflective layer is a plating layer arranged on the surface of the diffusion plate close to the 1/4 wave plate; or, the semi-transparent and semi-reflective layer is a plating layer arranged on the surface of the 1/4 wave plate close to the diffusion plate; or, the semi-transparent semi-reflecting layer is an independent membrane.
The transparent plate is a transparent support plate, and the 1/4 wave plate is arranged on one side of the transparent support plate 123 far away from the reflective polarized light brightness enhancement film; the light source is direct type and is arranged on one side of the 1/4 wave plate far away from the transparent support plate.
Wherein, backlight unit still includes: and the optical function layer is arranged on one side of the reflection type polarized light brightness enhancement film far away from the 1/4 wave plate.
In order to solve the above technical problem, the second technical solution adopted by the present application is: provided is a display device including: a liquid crystal display panel; the backlight module is the backlight module.
The beneficial effect of this application is: different from the prior art, the backlight module comprises a light source, a light-transmitting plate, a reflecting polarized light brightening membrane and an 1/4 wave plate; the reflector plate is arranged on one side of the light-transmitting plate; the reflective polarized light brightening membrane is arranged on the other side of the light-transmitting plate; the 1/4 wave plate and the light-transmitting plate are arranged on the same side of the reflective polarized light brightness enhancement film. According to the application, the 1/4 wave plate is arranged on one side, provided with the light transmission plate, of the reflection type polarized light brightening membrane, the polarized light which is reflected by the reflection type polarized light brightening membrane and does not penetrate through the light transmission plate passes through the 1/4 wave plate and then becomes circularly polarized light, the phase mutation occurs through reflection of the reflection plate, and after passing through the 1/4 wave plate, the polarized light which can penetrate through the reflection type polarized light brightening membrane can be converted into the polarized light, so that the backlight recovery efficiency is improved, and the display quality of the display panel is improved; and the passing times of the backlight generated by the light source in the reflection type polarized light brightness enhancement film is reduced, and the phenomenon that the recycled backlight light is yellow is further avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device provided in the present application;
FIG. 2 is a schematic structural diagram of a display device according to a first embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating a second embodiment of a display device according to the present application;
FIG. 4 is a schematic structural diagram of a display device according to a third embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of a fourth embodiment of a display device provided in the present application;
FIG. 6 is a schematic structural diagram of a fifth embodiment of a display device provided in the present application;
FIG. 7 is a schematic structural diagram of a sixth embodiment of a display device provided in the present application;
fig. 8 is a schematic structural diagram of a seventh embodiment of a display device provided in the present application.
In the figure: a display device 300; a backlight module 100; a light source 11; a light-transmitting plate 12; a light guide plate 121; a transflective layer 18; a transparent support plate 123; a diffuser plate 124; a reflective sheet 13; a specular reflection sheet 131; a reflection type polarized light brightening membrane 14; 1/4 wave plate 15; supporting legs 16; an optically functional layer 17; a liquid crystal display panel 200; an upper polarizer 21; a color film substrate 22; an array substrate 24; a lower polarizer 25; a housing 400; an installation space 401; a back plate 500; an extension 501; a housing chamber 502; a control panel 600; the buffer connector 700.
Detailed Description
The following describes in detail the embodiments of the present application with reference to the drawings attached hereto.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, interfaces, techniques, etc. in order to provide a thorough understanding of the present application.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. All directional indications (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Currently, the backlight source of the LCD is a natural light source, which loses half or more of its energy after passing through the lower polarizer of the LCD.
In order to improve the Brightness of the LCD display, a reflective polarizing Brightness Enhancement Film (DBEF) is used to reflect the vibration direction energy absorbed by the lower polarizer back to the backlight system, and after multiple reflections, the energy is changed into natural light again, and then the natural light is screened by the DBEF, and after multiple reflection conversion, the original energy loss part is reused.
However, the reflected light is partially absorbed by the light guide plate, the diffusion sheet, the reflection sheet and the like through multiple reflection conversion and screening processes, that is, the brightness of the backlight directly measured by using the DBEF is reduced. When the lower polarizer adopting the DBEF together with the LCD is adopted, compared with the lower polarizer without the DBEF together with the LCD, the brightness of the liquid crystal display is improved. The problem of excessive yellowing caused by multiple times of passing of the recycled light in the DBEF is solved, the absorption rate of the DBEF to short-wavelength light is larger than that of long-wavelength light, the back light is caused to be yellowish, the light is recycled for multiple times, the recycled light needs to pass through part of the DBEF and then be reflected back to a backlight system every time, the recycling grade is increased, the light long-wave proportion is increased, and the light emitted by the backlight module is more yellowish.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a display device provided in the present application;
fig. 2 is a schematic structural diagram of a display device according to a first embodiment of the present disclosure.
In order to solve the low problem that just there is the bias yellow of recovery light in recovery efficiency in a poor light, 1/4 wave plate 15 has been set up in the backlight unit 100 that this application provided, the polarized light that is reflected by reflective polarisation brightening diaphragm 14 converts through 1/4 wave plate 15, can make recovery light convert the polarized light that can directly pass reflective polarisation brightening diaphragm 14, and the reflection number of times of retrieving light reduces, both can improve the recovery efficiency of backlight, can also avoid the backlight of retrieving to appear the problem of bias yellow.
The present application provides a display device 300, the display device 300 includes a liquid crystal display panel 200 and a backlight module 100. The backlight module 100 is used for providing a light source 11 for the liquid crystal display panel 200.
In one embodiment, the display device 300 includes a liquid crystal display panel 200, a backlight module 100, a housing 400, a back plate 500, a control panel 600 and a buffer connector 700. The housing 400 has an installation space 401, and the backlight module 100, the liquid crystal display panel 200, the backplane 500, the control panel 600 and the buffer connector 700 are all accommodated in the installation space 401. The backlight module 100 is disposed on one side of the liquid crystal display panel 200, the back plate 500 is disposed on one side of the backlight module 100 away from the liquid crystal display panel 200, an extending portion 501 is disposed on one side of the back plate 500, the extending portion 501 has an accommodating cavity 502, and the accommodating cavity 502 can be used for accommodating the light source 11 disposed on one side of the backlight module 100. Specifically. The light source 11 is fixed to the inner wall of the housing chamber 502 by the light source base 111. The control panel 600 is respectively connected to the backlight module 100 and the liquid crystal display panel 200 for controlling the backlight module 100 and the liquid crystal display panel 200, and the buffer connector 700 is disposed between the liquid crystal display panel 200 and the extension 501 of the back plate 500.
The liquid crystal display panel 200 includes an array substrate 24, a color filter substrate 22, and a liquid crystal layer (not shown). The array substrate 24 and the color film substrate 22 are arranged oppositely, and the liquid crystal layer is arranged between the color film substrate 22 and the array substrate 24. The liquid crystal display panel 200 further includes an upper polarizer 21 and a lower polarizer 25. The upper polarizer 21 is disposed on a side of the color filter substrate 22 away from the array substrate 24, and the lower polarizer 25 is disposed on a side of the array substrate 24 away from the color filter substrate 22. That is, the lower polarizer 25 is disposed close to the backlight assembly 100. The array substrate 24 may further include other functional layers, such as a TFT layer, a pixel electrode layer, and the like. The color filter substrate 22 may also include other functional layers, such as a common electrode layer, a filter layer, a matrix, etc.
The backlight module 100 includes a light source 11, a transparent plate 12, a reflective plate 13, a reflective polarizing brightness enhancement film 14, and an 1/4 wave plate 15. The reflective sheet 13 is disposed on one side of the transparent plate 12, the reflective polarized light brightness enhancement film 14 is disposed on the other side of the transparent plate 12, and the 1/4 wave plate 15 and the transparent plate 12 are disposed on the same side of the reflective polarized light brightness enhancement film 14. Specifically, the 1/4 wave plate 15 is disposed between the reflective polarized-light brightness-increasing film 14 and the transparent plate 12. The light-transmitting plate 12 mainly functions to convert the incident point light source 11 into the surface light source 11 by using the principle of light scattering.
In this embodiment, the light source 11 may be of a side-in type and disposed on at least one side surface of the light guide plate 121. Specifically, the light source 11 is located at one side surface of the light guide plate 121, and light emitted from the light source 11 is transmitted to the other end of the light guide plate 121 and then emitted from the front surface of the light guide plate 121. The light source 11 may also be a direct type light source and is disposed on a side of the light-transmitting plate 12 away from the 1/4 wave plate 15. Specifically, light emitted from the light source 11 is guided toward the surface of the light guide plate 121 near the 1/4 wave plate 15. That is, the light emitted from the light source 11 is transmitted to the front surface of the light guide plate 121 and is emitted from the front surface of the light guide plate 121. In this embodiment, the light source 11 is an LED for emitting natural light. In other embodiments, the light source 11 may be other light sources, such as a fluorescent lamp, but is not limited herein.
In an embodiment, the transparent plate 12 is a light guide plate 121, and the reflective sheet 13 is a mirror reflective sheet 131. The specular reflection sheet 131 is disposed on one side of the light guide plate 121, the reflective polarized light brightness enhancement film 14 is disposed on one side of the light guide plate 121 away from the specular reflection sheet 131, and the 1/4 wave plate 15 is disposed between the reflective polarized light brightness enhancement film 14 and the light guide plate 121. The light source 11 is disposed on at least one side of the light guide plate 121. The natural light emitted by the light source 11 is transmitted to the other side of the light guide plate 121, and is transmitted to the 1/4 wave plate 15 by the side of the light guide plate 121 away from the specular reflection sheet 131, and the natural light passes through the 1/4 wave plate 15 and then continues to pass through the reflective polarized light brightness enhancement film 14. In natural light, the X-polarized light passes through the reflective polarized light brightness enhancement film 14, and the Y-polarized light does not pass through the reflective polarized light brightness enhancement film 14. Wherein, the X-direction polarized light is the polarized light that can pass through the lower polarizer 25 of the liquid crystal display panel 200; the Y-direction polarized light may be polarized light absorbed by the lower polarizer 25 of the liquid crystal display panel 200. The Y-direction polarized light in the natural light is reflected by the reflective polarized light brightening membrane 14, and is converted into the normal rotation circular polarized light after passing through the 1/4 wave plate 15, the normal rotation circular polarized light passes through the light guide plate 121 and is reflected by the mirror reflection sheet 131, half-wave loss occurs, the phase mutation pi of the normal rotation circular polarized light after being reflected by the mirror reflection sheet 131 is converted into the reverse rotation circular polarized light, the reverse rotation circular polarized light passes through the 1/4 wave plate 15 and is converted into the X-direction polarized light, and then the X-direction polarized light directly and sequentially passes through the reflective polarized light brightening membrane 14 and the lower polarizer 25 of the liquid crystal display panel 200, so that the recovery of the backlight light is realized, and the purpose of brightening is achieved.
The natural light only needs to pass reflective polarisation blast diaphragm 14 in proper order, once reflected by reflective polarisation blast diaphragm 14, once specular reflection piece 131 reflects, once again through reflective polarisation blast diaphragm 14, can realize the most energy conversion of the natural light that light source 11 sent for X direction polarized light, very big reduction the energy loss that needs to pass through multiple reflection conversion and cause among the recovery light process, and can also reduce the number of times that recovery light passed reflective polarisation blast diaphragm 14, and then improve the excessive yellow problem of recovery light.
Further, the backlight module 100 further includes an optical function layer 17, and the optical function layer 17 is disposed on a side of the reflective polarized light brightness enhancement film 14 away from the 1/4 wave plate 15. The optical function layer 17 includes optical adjustment and control elements such as a prism sheet and a diffusion sheet.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a display device according to a second embodiment of the present application.
The structure of the second embodiment of the display device 300 is substantially the same as that of the first embodiment of the display device 300, except that the backlight module 100 of the display device 300 further includes a transflective layer 18 disposed between the light guide plates 121 and 1/4 and the wave plate 15. The half-transmitting and half-reflecting layer 18 can reduce the energy absorbed by the light guide plate 121 by the normal circular polarized light converted by the 1/4 wave plate 15, and further can reduce the proportion of the light reflected diffusely by the surface microstructure of the light guide plate 121 close to the specular reflection sheet 131 and converted into natural light, thereby further improving the recovery efficiency of the recovered light.
Specifically, the transflective layer 18 may be a plating layer disposed on the surface of the light guide plate 121 near the 1/4 wave plate 15. In another embodiment, the transflective layer 18 may also be a plating layer disposed on the surface of the 1/4 wave plate 15 close to the light guide plate 121. In other embodiments, the transflective layer 18 may be a separate membrane. In this embodiment, the ratio of the transmitted energy to the reflected energy of the transflective layer 18 ranges from 1: 9-9: 1.
in one embodiment, the natural light emitted from the light source 11 is transmitted to the other side of the light guide plate 121, and transmitted from the side of the light guide plate 121 far away from the specular reflection sheet 131 to the 1/4 wave plate 15 through the transflective layer 18, and the natural light passes through the 1/4 wave plate 15 and then continues to pass through the reflective polarized brightness enhancement film 14. In natural light, the X-polarized light passes through the reflective polarized light brightness enhancement film 14, and the Y-polarized light does not pass through the reflective polarized light brightness enhancement film 14. The Y-direction polarized light is reflected by the reflective polarized light brightening membrane 14, passes through the 1/4 wave plate 15 and then is converted into the normal circular polarized light, when the normal circular polarized light passes through the semi-transparent semi-reflective layer 18, a part of the normal circular polarized light is reflected by the semi-transparent semi-reflective layer 18 and then generates phase mutation pi, and half-wave loss occurs, so that the normal circular polarized light is converted into the reverse circular polarized light; the other part of the normal rotation circular polarized light passes through the light guide plate 121 and is reflected by the specular reflection sheet 131, half-wave loss occurs, and the phase mutation pi of the normal rotation circular polarized light is converted into the reverse rotation circular polarized light after being reflected by the specular reflection sheet 131. The reverse-rotation circular polarized light converted by the semi-transparent semi-reflective layer 18 and the reverse-rotation circular polarized light converted by the mirror reflector 131 both pass through the 1/4 wave plate 15 and then are converted into polarized light in the X direction, and further directly pass through the reflective polarized light brightness enhancement film 14 and the lower polarizer 25 of the liquid crystal display panel 200 in sequence, so that the recycling of backlight light is realized, and the purpose of brightness enhancement is achieved.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a display device according to a third embodiment of the present application.
The structure of the third embodiment of the display device 300 is substantially the same as that of the first embodiment of the display device 300, except that the light source 11 of the display device 300 is a direct type light source and is disposed on a side of the light-transmitting plate 12 away from the reflective polarizing brightness enhancement film 14. The light-transmitting plate 12 may be a transparent support plate 123, and the light source 11 is disposed on a side of the transparent support plate 123 far away from the 1/4 wave plate 15.
The light-transmitting plate 12 is a transparent support plate 123. In one embodiment, the transparent support plate 123 is disposed between the reflective polarization brightness enhancement film 14 and the specular reflection sheet 131, and the transparent support plate 123 is connected to and fixed at a distance from the specular reflection sheet 131 by the support legs 16. In order to reduce the stress influence of the supporting legs 16 on the 1/4 wave plate 15, the 1/4 wave plate 15 is disposed between the reflective polarization brightness enhancement film 14 and the transparent supporting plate 123. The absorption of the recycled light can be reduced by arranging the transparent supporting plate 123, and the recycling efficiency of the recycled light is further improved.
In the third embodiment, the light source 11 is disposed on the plane of the specular reflection sheet 131, and emits natural light that is directly incident on the transparent support plate 123, the natural light passes through the transparent support plate 123 and then is transmitted to the 1/4 wave plate 15, and the natural light passes through the 1/4 wave plate 15 and then continues to pass through the reflective polarized light brightness enhancement film 14. In natural light, the X-polarized light passes through the reflective polarized light brightness enhancement film 14, and the Y-polarized light does not pass through the reflective polarized light brightness enhancement film 14. The polarized light in the Y direction is reflected by the reflective polarized light brightening membrane 14, and is converted into the normal circular polarized light after passing through the 1/4 wave plate 15, the normal circular polarized light passes through the transparent support plate 123 and is reflected by the mirror reflection sheet 131, half-wave loss occurs, and the normal circular polarized light is converted into the reverse circular polarized light after being reflected by the mirror reflection sheet 131 and then subjected to phase mutation pi. The anti-rotation circular polarized light converted by the specular reflection sheet 131 sequentially passes through the transparent support plate 123 and the 1/4 wave plate 15 and then is converted into polarized light in the X direction, and further directly sequentially passes through the reflective polarized light brightening membrane 14 and the lower polarizer 25 of the liquid crystal display panel 200, so that the backlight light is recycled, and the purpose of brightening is achieved.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a display device according to a fourth embodiment of the present application.
The structure of the fourth embodiment of the display device 300 is substantially the same as that of the third embodiment of the display device 300, except that in the display device 300 of the fourth embodiment, the 1/4 wave plate 15 is disposed on the side of the transparent support plate 123 away from the reflective polarizing brightness enhancement film 14. That is, the transparent support plate 123 is disposed between the 1/4 wave plate 15 and the reflective polarization brightness enhancement film 14, the support leg 16 is disposed between the specular reflection sheet 131 and the 1/4 wave plate 15, and fixedly supports the specular reflection sheet 131 and the 1/4 wave plate 15.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a display device according to a fifth embodiment of the present application.
The structure of the fifth embodiment of the display device 300 is substantially the same as that of the third embodiment of the display device 300, except that the light-transmitting plate 12 in the display device 300 of the fifth embodiment of the present application may be a diffuser 124, the diffuser 124 is disposed between the reflective polarization brightness enhancement film 14 and the specular reflection sheet 131, and the diffuser 124 is supported by the supporting legs 16 and fixes the distance between the diffuser 124 and the specular reflection sheet 131. In order to reduce the stress effect of the supporting legs 16 on the 1/4 wave plate 15, the 1/4 wave plate 15 is disposed between the reflective polarization brightness enhancement film 14 and the diffusion plate 124. Can improve non-light tight homogeneity through setting up diffuser plate 124, but set up diffuser plate 124 and can cause the energy loss of retrieving the light in-process normal circular polarized light, the function irregular transformation takes place for partial normal circular polarized light behind diffuser plate 124, becomes the natural light, and then reduces the efficiency of the light that the single reflection conversion was retrieved.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a display device according to a sixth embodiment of the present application.
The structure of the sixth embodiment of the display device 300 is substantially the same as that of the fifth embodiment of the display device 300, except that in the display device 300 of the sixth embodiment, the 1/4 wave plate 15 is disposed on the side of the diffuser plate 124 away from the reflective polarization brightness enhancement film 14. That is, the diffuser 124 is disposed between the 1/4 wave plate 15 and the reflective polarization brightness enhancement film 14, the supporting leg 16 is disposed between the specular reflection sheet 131 and the 1/4 wave plate 15, and fixedly supports the specular reflection sheet 131 and the 1/4 wave plate 15.
In an embodiment, please refer to fig. 8, and fig. 8 is a schematic structural diagram of a display device according to a seventh embodiment of the present application.
The structure of the seventh embodiment of the display device 300 is substantially the same as that of the third embodiment of the display device 300, except that, in order to improve the uniformity of the light of the backlight module 100 and improve the efficiency of the backlight light source 11 for recycling the light, the backlight module 100 of the display device 300 further includes a transflective layer 18, and the transflective layer 18 is disposed between the diffusion plate 124 and the 1/4 wave plate 15.
The energy loss of the normal circular polarized light in the light recovery process caused by the normal circular polarized light converted by the 1/4 wave plate 15 passing through the diffusion plate 124 can be reduced by arranging the transflective layer 18. Part of the normal circular polarized light converted by the 1/4 wave plate 15 is directly reflected by the semi-transparent and semi-reflective layer 18 to be converted into reverse circular polarized light; the other part of the normal circular polarized light passes through the diffusion plate 124, and is transmitted and converted into reverse circular polarized light through the mirror reflection sheet 131, and the reverse circular polarized light passes through the diffusion plate 124 and the semi-transparent semi-reflective layer 18, and then is converted into X-direction polarized light through the 1/4 wave plate 15. The polarized light in the X direction directly passes through the reflective polarized light brightening membrane 14 and the lower polarizer 25 of the liquid crystal display panel 200 in sequence, so that the backlight light is recycled, and the aim of brightening is fulfilled. Partial normal rotation circular polarized light can be directly reflected by the semi-transparent semi-reflective layer 18, and the partial normal rotation circular polarized light does not need to pass through the diffusion plate 124, so that the purpose of improving the efficiency of light recovery is achieved. The transflective layer 18 in this embodiment may be a plating layer disposed on the surface of the diffusion plate 124 close to the 1/4 wave plate 15. In another embodiment, the transflective layer 18 may be a plating layer disposed on the surface of the 1/4 wave plate 15 near the diffusion plate 124. In other embodiments, the transflective layer 18 may be a separate membrane. In this embodiment, the ratio of the transmitted energy to the reflected energy of the transflective layer 18 ranges from 1: 9-9: 1.
the backlight module in the display device provided by the embodiment includes a light source, a transparent plate, a reflective sheet, a reflective polarized light brightness enhancement film and an 1/4 wave plate; the reflector plate is arranged on one side of the light-transmitting plate; the reflective polarized light brightening membrane is arranged on the other side of the light-transmitting plate; the 1/4 wave plate and the light-transmitting plate are arranged on the same side of the reflective polarized light brightness enhancement film. According to the application, the 1/4 wave plate is arranged on one side, provided with the light transmission plate, of the reflection type polarized light brightening membrane, the polarized light which is reflected by the reflection type polarized light brightening membrane and does not penetrate through the light transmission plate passes through the 1/4 wave plate and then becomes circularly polarized light, the phase mutation occurs through reflection of the reflection plate, and after passing through the 1/4 wave plate, the polarized light which can penetrate through the reflection type polarized light brightening membrane can be converted into the polarized light, so that the backlight recovery efficiency is improved, and the display quality of the display panel is improved; and the passing times of the backlight generated by the light source in the reflection type polarized light brightness enhancement film is reduced, and the phenomenon that the recycled backlight light is yellow is further avoided.
The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings are included in the scope of the present disclosure.
Claims (10)
1. A backlight module includes:
a light source;
a light-transmitting plate;
the reflecting sheet is arranged on one side of the light-transmitting plate;
the reflective polarized light brightening membrane is arranged on the other side of the light-transmitting plate;
the backlight module is characterized by further comprising an 1/4 wave plate, wherein the 1/4 wave plate and the light-transmitting plate are arranged on the same side of the reflective polarized light brightness enhancement film.
2. The backlight module as claimed in claim 1, wherein the 1/4 wave plate is disposed between the reflective polarizing brightness enhancement film and the light-transmissive plate;
the light transmitting plate is a light guide plate, and the light source is of a side-in type and is arranged on the side surface of the light guide plate; or
The light source is of a direct type and is arranged on one side, far away from the 1/4 wave plate, of the light-transmitting plate.
3. The backlight module according to claim 2,
the light transmitting plate is a light guide plate, and the light source is of a side-in type and is arranged on the side surface of the light guide plate; the backlight module also comprises a semi-transparent and semi-reflective layer arranged between the light guide plate and the 1/4 wave plate.
4. The backlight module according to claim 3,
the semi-transparent and semi-reflective layer is a plating layer arranged on the surface of the light guide plate close to the 1/4 wave plate; or the like, or, alternatively,
the semi-transparent and semi-reflective layer is a plating layer arranged on the surface of the 1/4 wave plate close to the light guide plate; or the like, or, alternatively,
the semi-permeable and semi-reflective layer is an independent membrane.
5. The backlight module according to claim 2,
the light source is a direct type light source and is arranged on one side of the light transmission plate, which is far away from the 1/4 wave plate, and the light transmission plate is a transparent support plate or a diffusion plate.
6. The backlight module according to claim 5,
the light-transmitting plate is the diffusion plate; the backlight module also comprises a semi-transparent and semi-reflective layer arranged between the diffusion plate and the 1/4 wave plate.
7. The backlight module according to claim 6,
the semi-transparent and semi-reflective layer is a plating layer arranged on the surface of the diffusion plate close to the 1/4 wave plate; or the like, or, alternatively,
the semi-transparent and semi-reflective layer is a plating layer arranged on the surface of the 1/4 wave plate close to the diffusion plate; or the like, or, alternatively,
the semi-transparent semi-reflecting layer is an independent membrane.
8. The backlight module according to claim 1,
the light-transmitting plate is a transparent support plate, and the 1/4 wave plate is arranged on one side of the transparent support plate, which is far away from the reflective polarized light brightening membrane; the light source is direct type and is arranged on one side of the 1/4 wave plate far away from the transparent support plate.
9. The backlight module of claim 1, further comprising:
and the optical function layer is arranged on one side of the reflection type polarized light brightness enhancement film far away from the 1/4 wave plate.
10. A display device, comprising:
a liquid crystal display panel;
a backlight module as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210295603.3A CN114815385A (en) | 2022-03-23 | 2022-03-23 | Display device and backlight module thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210295603.3A CN114815385A (en) | 2022-03-23 | 2022-03-23 | Display device and backlight module thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114815385A true CN114815385A (en) | 2022-07-29 |
Family
ID=82530060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210295603.3A Pending CN114815385A (en) | 2022-03-23 | 2022-03-23 | Display device and backlight module thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114815385A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004170867A (en) * | 2002-11-22 | 2004-06-17 | Seiko Epson Corp | Liquid crystal display device and electronic equipment |
| US20050024891A1 (en) * | 2003-08-01 | 2005-02-03 | Yi-Shiuan Tsai | Direct backlight module |
| CN1885121A (en) * | 2005-06-24 | 2006-12-27 | 三星电子株式会社 | Liquid crystal display |
| CN201145795Y (en) * | 2008-01-25 | 2008-11-05 | 胜华科技股份有限公司 | Backlight module and LCD device |
| US20150009451A1 (en) * | 2012-09-14 | 2015-01-08 | Apple Inc. | Displays With Reflective Polarizers |
| CN104914624A (en) * | 2015-06-19 | 2015-09-16 | 京东方科技集团股份有限公司 | Light guide structure, backlight module and display device |
| CN105408810A (en) * | 2013-07-22 | 2016-03-16 | 富士胶片株式会社 | Liquid-crystal display device |
| CN105874361A (en) * | 2013-12-24 | 2016-08-17 | 富士胶片株式会社 | Optical member and display device |
| CN108398832A (en) * | 2018-03-27 | 2018-08-14 | 成都京东方光电科技有限公司 | A kind of display device |
| CN108474522A (en) * | 2015-12-25 | 2018-08-31 | 富士胶片株式会社 | Staight downward type backlight unit |
| CN108474524A (en) * | 2015-12-25 | 2018-08-31 | 富士胶片株式会社 | Edge-illumination type back light unit |
| CN113885198A (en) * | 2020-07-01 | 2022-01-04 | 莱钶科技(上海)有限公司 | Near-to-eye display optical device |
-
2022
- 2022-03-23 CN CN202210295603.3A patent/CN114815385A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004170867A (en) * | 2002-11-22 | 2004-06-17 | Seiko Epson Corp | Liquid crystal display device and electronic equipment |
| US20050024891A1 (en) * | 2003-08-01 | 2005-02-03 | Yi-Shiuan Tsai | Direct backlight module |
| CN1885121A (en) * | 2005-06-24 | 2006-12-27 | 三星电子株式会社 | Liquid crystal display |
| CN201145795Y (en) * | 2008-01-25 | 2008-11-05 | 胜华科技股份有限公司 | Backlight module and LCD device |
| US20150009451A1 (en) * | 2012-09-14 | 2015-01-08 | Apple Inc. | Displays With Reflective Polarizers |
| CN105408810A (en) * | 2013-07-22 | 2016-03-16 | 富士胶片株式会社 | Liquid-crystal display device |
| CN105874361A (en) * | 2013-12-24 | 2016-08-17 | 富士胶片株式会社 | Optical member and display device |
| CN104914624A (en) * | 2015-06-19 | 2015-09-16 | 京东方科技集团股份有限公司 | Light guide structure, backlight module and display device |
| CN108474522A (en) * | 2015-12-25 | 2018-08-31 | 富士胶片株式会社 | Staight downward type backlight unit |
| CN108474524A (en) * | 2015-12-25 | 2018-08-31 | 富士胶片株式会社 | Edge-illumination type back light unit |
| CN108398832A (en) * | 2018-03-27 | 2018-08-14 | 成都京东方光电科技有限公司 | A kind of display device |
| CN113885198A (en) * | 2020-07-01 | 2022-01-04 | 莱钶科技(上海)有限公司 | Near-to-eye display optical device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4294250B2 (en) | Liquid crystal display | |
| KR20040065416A (en) | Liquid crystal displaying apparatus | |
| CN102879949B (en) | Liquid crystal display module | |
| CN110764307B (en) | Liquid crystal display panel and liquid crystal display device | |
| CN101120281B (en) | Liquid crystal display device and mobile station having the same | |
| CN103244875A (en) | Display backlight structure with nano metal grating | |
| US20070097504A1 (en) | Dual panel display | |
| CN100409077C (en) | Rod-shaped light transmission body, illuminating device, and liquid crystal display device | |
| US7268844B2 (en) | Liquid crystal display device | |
| US20090310071A1 (en) | Transreflective display panel and display apparatus including the same | |
| CN114815385A (en) | Display device and backlight module thereof | |
| KR20080088826A (en) | Lcd with back light unit | |
| KR101331814B1 (en) | Polariation sheet and lliquid crystal display device having therof | |
| JP2007256874A (en) | Planar polarized light source device and liquid crystal display device | |
| CN100443988C (en) | Display with double faces | |
| JP2001222009A (en) | Liquid crystal device and electronic instrument | |
| KR100433659B1 (en) | Apparatus for thin film transistor liquid crystal display device | |
| TWI355537B (en) | Backlight unit | |
| TWM242730U (en) | Liquid crystal display and backlight module used therein | |
| CN213122444U (en) | AR optical system | |
| KR101281668B1 (en) | Reflective polarizing plate and liquid crystal display device having thereof | |
| CN218675357U (en) | Brightening polarizer | |
| CN214151326U (en) | Display module assembly and display device | |
| JPH10247410A (en) | Back light device and liquid crystal display device using it | |
| CN216956603U (en) | Display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220729 |