CN108594535B - Backlight module, LCD display screen and VR head display - Google Patents
Backlight module, LCD display screen and VR head display Download PDFInfo
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- CN108594535B CN108594535B CN201810701289.8A CN201810701289A CN108594535B CN 108594535 B CN108594535 B CN 108594535B CN 201810701289 A CN201810701289 A CN 201810701289A CN 108594535 B CN108594535 B CN 108594535B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 26
- 238000005286 illumination Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims description 10
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000007493 shaping process Methods 0.000 description 25
- 210000003128 head Anatomy 0.000 description 12
- 238000010168 coupling process Methods 0.000 description 10
- 238000005859 coupling reaction Methods 0.000 description 10
- 239000010408 film Substances 0.000 description 10
- 239000013307 optical fiber Substances 0.000 description 10
- 230000008878 coupling Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 6
- 239000000835 fiber Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
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- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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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
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/32—Holograms used as optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B2005/1804—Transmission gratings
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention relates to the technical field of display screens and virtual reality, in particular to a backlight module, an LCD display screen and a VR head display. The backlight module comprises a light source module, a first expansion panel, a second expansion panel and a directional diffusion module. The first expansion panel has a diffraction microstructure or holographic structure having a transmission diffraction effect on both a plane S131 on a side close to the second expansion panel and a plane S132 on a side far from the second expansion panel, and the plane S131 is parallel to the plane S132. After the collimated or nearly collimated illumination beam provided by the light source module is transmitted and expanded in the vertical direction and the horizontal direction through the first expansion panel and the second expansion panel respectively, the directional diffusion module controls the emergent beam angle of the output light according to the preset vertical direction and horizontal direction, so that the light energy utilization rate of the backlight module is greatly improved, the energy consumption is reduced, and the stray light is reduced. The LCD display screen and the VR head display comprise the backlight module.
Description
Technical Field
The invention relates to the technical field of display screens and virtual reality, in particular to a backlight module, an LCD display screen and a VR head display.
Background
The virtual content display of the VR head display mainly comprises a display screen and an optical magnifying glass set, and the display screen is typically an LCD display screen. The display effect of the LCD display screen has a wide viewing angle characteristic and can reach 160-170 degrees generally. When a display screen with a wide viewing angle is used for VR head display, only light beams within 30 to 50 degrees of viewing angle can be received by a user. As shown in fig. 1, only the light beams in the a and B regions can be received by the human eye at the P1 and P2 points on the LCD display screen, respectively. And light beams in the residual view angles form stray light in a space formed by the display screen and the optical magnifier group due to scattering and refraction reflection effects, so that the receiving of the virtual reality content by a user is influenced. Also, the inefficiency of the display screen energy utilization at wide viewing angles may result in increased power consumption.
Disclosure of Invention
Accordingly, the present invention is directed to a backlight module, an LCD display and a VR head display with smaller viewing angle, so as to solve the above-mentioned problems.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the preferred embodiment of the invention provides a backlight module, which comprises a light source module, a first expansion panel, a second expansion panel and a directional diffusion module;
the light source module is positioned on an incident light path of the first expansion panel, the second expansion panel is positioned on an emergent light path of the first expansion panel, and the directional diffusion module is positioned on the emergent light path of the second expansion panel;
the first expansion panel is provided with a diffraction microstructure or a holographic structure which plays a role in transmission diffraction on a plane S131 close to one side of the second expansion panel, and the first expansion panel is provided with a diffraction microstructure or a holographic structure which plays a role in transmission diffraction on a plane S132 far away from one side of the second expansion panel, and the plane S131 is parallel to the plane S132;
the second expansion panel is provided with a diffraction microstructure or a holographic structure with a transmission diffraction effect on a plane S151 close to one side of the directional diffusion module, and the second expansion panel is provided with a diffraction microstructure or a holographic structure with a transmission diffraction effect on a plane S152 far away from one side of the directional diffusion module, wherein the plane S151 is parallel to the plane S152;
the collimation or near collimation illumination light beam provided by the light source module is transmitted and expanded in the vertical direction and the horizontal direction respectively through the first expansion panel and the second expansion panel to form a collimation wide light beam or a near collimation wide light beam, and the directional diffusion module controls the emergent light beam angle of the output light according to the preset vertical direction and the horizontal direction.
Optionally, the transmission energy of adjacent sections of the plane S131 and the plane S132 of the first expansion panel tends to be the same, the transmission energy of each section of the plane S131 tends to be the same, the transmission energy of each section of the plane S132 tends to be the same, and the sum of the transmission energy of the plane S131 and the plane S132 of the first expansion panel tends to be the total light energy emitted by the light source module.
Optionally, the first expansion panel is configured to expand the incident beam in the Y direction, and the second expansion panel is configured to expand the incident beam in the X direction, where w=h×cos β1;
wherein W is the aperture of the light source module along the direction perpendicular to the incident direction of the light beam; h is the distance between the upper and lower planes of the first expansion panel along the X direction; β1 is an included angle between the parallel or near-parallel light beam output by the light source module and the plane S131 of the first expansion panel.
Optionally, the first expansion panel controls the outgoing beam angle of the outgoing light ray to be between 0 ° and 30 ° in the vertical direction, and the second expansion panel controls the outgoing beam angle of the outgoing light ray to be between 0 ° and 30 ° in the horizontal direction.
Optionally, the first expansion panel controls the outgoing beam angle of the outgoing light ray to be between 0 ° and 20 ° in the vertical direction, and the second expansion panel controls the outgoing beam angle of the outgoing light ray to be between 0 ° and 40 ° in the horizontal direction.
Optionally, the directional diffusion module is a bidirectional directional diffusion film, or a dual cylindrical lens array placed orthogonally, or a unidirectional directional diffusion film placed orthogonally.
Optionally, the directional diffusion module is attached to the second expansion panel.
Another preferred embodiment of the present invention provides an LCD display, which includes the above-mentioned backlight module of the liquid crystal panel.
Optionally, the liquid crystal panel, the directional diffusion module and the second expansion panel are mutually attached.
Another preferred embodiment of the present invention provides a VR head display comprising the above LCD display.
According to the backlight module provided by the preferred embodiment of the invention, the light beam caliber of the light source module is expanded in the vertical and horizontal directions by integrating and designing the light source module, the first expansion panel, the second expansion panel and the directional diffusion module, so that the light source module does not need to output a collimated wide light beam or a near collimated wide light beam, the optical system structure of the light source module is simpler, and meanwhile, the emergent light beam angle of the output light is controlled to be smaller by adopting the directional diffusion module, so that the light energy utilization rate of the backlight module is greatly improved, the energy consumption is reduced and the stray light is reduced.
The LCD display screen and the VR head display provided by the preferred embodiment of the invention comprise the backlight module, so that the invention has similar beneficial effects.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. It is to be understood that the following drawings illustrate only certain embodiments of the invention and are therefore not to be considered limiting of its scope, for the person of ordinary skill in the art may admit to other equally relevant drawings without inventive effort.
Fig. 1 is a schematic view of a conventional VR head display with a wide viewing angle.
Fig. 2 is a schematic structural diagram of a backlight module according to a preferred embodiment of the invention.
Fig. 3 is a schematic structural diagram of a light source module according to a preferred embodiment of the invention.
Fig. 4 is a schematic structural diagram of another light source module according to the preferred embodiment of the present invention.
Fig. 5 is a schematic diagram of the first expansion panel shown in fig. 2 transmitting and expanding light.
Fig. 6 is a numbering diagram of the planar S131 of the first expansion panel divided into regions in the Y direction.
Fig. 7 is a schematic structural diagram of an LCD display according to a preferred embodiment of the present invention.
Icon 10-backlight module; 11-a light source module; 13-a first expansion panel; 15-a second expansion panel; 17-a directional diffusion module; 111-an illumination source; 113-a beam shaping combiner; 1111-red LED light source; 1112-green LED light source; 1113-blue LED light source; 1131-a collimation, beam expansion and shaping component; 1133-a beam combining unit; 11311-a first quasi-direct expanded beam shaping unit; 11312-a second collimating, beam expanding and shaping unit; 11313-a third collimating, beam expanding and shaping unit; 114-a light emitting unit; 115-a light collimator; 116-photosynthetic beam device; 117-coupling an optical fiber; 118-collimation lens group; 119-a speckle-dissipating device; 1-LCD display screen; 19-a liquid crystal panel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. In the description of the present invention, the terms "first," "second," "third," "fourth," and the like are used merely to distinguish between descriptions and are not to be construed as merely or implying relative importance.
Referring to fig. 2, fig. 2 is a schematic diagram of a backlight module 10 according to a preferred embodiment of the invention. As shown in fig. 2, the backlight module 10 includes: the light source module 11, the first expansion panel 13, the second expansion panel 15, and the directional diffusion module 17.
The light source module 11 is located on the incident light path of the first expansion panel 13, and provides collimated or near-collimated illumination light beam for the first expansion panel 13. The light source module 11 may be mainly composed of an LED (Light Emitting Diode light emitting Diode) light source or an LD (Laser Diode) light source and a collimator lens group, or may be mainly composed of an optical fiber light source and a collimator lens group.
For example, as shown in fig. 3, when the light source module 11 is mainly composed of an LED (Light Emitting Diode light emitting diode) light source and a collimator lens group, the light source module 11 may include an illumination light source 111 and a beam shaping combiner 113. The illumination light source 111 may employ a laser light source, an LED light source, or the like. Alternatively, in the present embodiment, the illumination light source 111 is an LED light source, which may include a red LED light source 1111, a green LED light source 1112, and a blue LED light source 1113. In another embodiment, the color of each LED in the LED light source may be set according to the actual requirement, so as to meet the actual requirement, which is not limited herein. The beam shaping beam combiner 113 is disposed on the optical path of the illumination light source 111, and is used for performing collimation, beam expansion, beam shaping and beam combining processing on the light beam emitted by the illumination light source 111. Optionally, in the present embodiment, the beam shaping and combining unit 113 includes a collimating and beam expanding and shaping component 1131 and a beam combining unit 1133. The collimated beam expansion shaping assembly 1131 includes a first collimated beam expansion shaping unit 11311, a second collimated beam expansion shaping unit 11312, and a third collimated beam expansion shaping unit 11313. The first collimating and beam expanding and shaping unit 11311 is configured to perform collimating, beam expanding and shaping on the light beam emitted by the red LED light source 1111. The second collimating, beam expanding and shaping unit 11312 is configured to perform collimating, beam expanding and shaping on the light beam emitted by the green LED light source 1112. The third collimating, beam expanding and shaping unit 11313 is configured to perform collimating, beam expanding and shaping on the light beam emitted by the blue LED light source 1113. In general, the collimation accuracy of the first, second, and third collimation expansion shaping units 11311, 11312, 11313 may be required to be in several milliradians. The beam combining unit 1133 is configured to combine the light beams after the collimation, expansion and shaping processes of the first collimation, expansion and shaping unit 11311, the second collimation, expansion and shaping unit 11312, and the third collimation, expansion and shaping unit 11313 into a single light beam. Optionally, the beam combining unit 1133 is an x-cube beam combining prism.
For example, as shown in fig. 4, when the light source module 11 is mainly composed of an optical fiber light source and a collimator lens group, the light source module 11 may include a light emitting unit 114, a light collimator 115, a light combiner 116, a coupling optical fiber 117, and a collimator lens group 118. The light emitting unit 114 may employ a laser light source, an LED light source, or the like. Alternatively, in the present embodiment, the light emitting unit 114 is an LD laser light source, such as a laser generating device. The laser emitting device may include a fast red laser emitting unit, a green laser emitting unit, and a blue laser emitting unit. In other embodiments, the color of each laser emitting unit in the laser generating device may be set according to actual needs, so as to meet the needs of the actual situation, which is not limited herein. The light collimator 115 may be an optical collimator lens known in the art for reducing the divergence angle of the light beam emitted from the laser generating device. The beam combiner 116 may be a light combining prism in the known art, which is not described here. The coupling fiber 117 may be a multimode fiber or a single mode fiber. The input end of the coupling optical fiber 117 may be a fused ball lens for increasing the caliber of the laser beam that the coupling optical fiber 117 can couple, so that the combined beam after passing through the beam combiner 116 is easily coupled into the coupling optical fiber 117. The output end of the coupling optical fiber 117 may be tapered to reduce the beam waist radius of the outgoing beam at the output end and increase the numerical aperture of the outgoing beam, so that the coupling optical fiber 117 outputs a light beam with a small light spot and a large outgoing angle. The collimating lens group 118 is used for collimating the light beam with small light spot and large exit angle output by the coupling optical fiber 117, so as to obtain a collimated light beam or a near-collimated light beam with better directivity. Typically, after passing through the collimating lens group 118, a collimated light beam or a near-collimated light beam with an exit angle in the range of 0 ° to 0.5 ° can be obtained. In particular implementations, the beam waist of the beam output by the coupling fiber 117 is positioned at or near the focal plane of the collimating lens group 118, thereby obtaining a collimated or near-collimated beam. When the light emitting unit 114 is a laser light source, the light source module 11 may further include a speckle dissipating device 119. The speckle removing device 119 attenuates the speckle effect of the laser light by changing the instantaneous phase of the laser light to thereby interfere with the coherence characteristics of the laser beam, so that the beam energy distribution provided by the light source module 11 is more uniform. The speckle removing device 119 may be a liquid crystal phase modulator or a vibration phase plate as known in the art, and is not limited thereto.
The first expansion panel 13 expands the light beam transmitted from the light source module 11 in the Y direction. The second expansion panel 15 expands the light beam transmitted from the first expansion panel 13 in the X direction. Finally, the light source module 11 is co-expanded into a collimated or near-collimated wide beam by the first expansion panel 13 and the second expansion panel 15.
Since the second expansion panel 15 is similar or identical to the first expansion panel 13, the first expansion panel 13 will be used as an example for the following description, and the second expansion panel 15 has the same or similar conclusion as the first expansion panel 13 for the sake of economy.
As shown in fig. 5, the first expansion panel 13 has a diffraction microstructure on a plane S131 near the side of the second expansion panel 15, the diffraction microstructure having an angle with respect to its normal lineHas a transmission diffraction function and a zero-order reflection diffraction function. The first expansion panel 13 also has a diffraction microstructure on the side facing away from the second expansion panel 15 in the plane S132, which has an angle of +.> Has a transmission diffraction function and a zero-order reflection diffraction function.
With continued reference to fig. 5, after the light beams L1 and L2 emitted from the light source module 11 enter the first expansion panel 13, the light beams first reach the plane S131, and a part of the energy carried by the light beams L1 and L2 is transmitted and diffracted by the diffraction microstructure on the plane S131 to exit the first expansion panel 13, where the transmitted and diffracted light beams are perpendicular to the plane S131; another part of the light energy is reflected and diffracted by the diffraction microstructure on the plane S131 and then continuously transmitted in the first expansion panel 13, and after being transmitted to the plane S132, one part of the light energy is reflected and diffracted by the diffraction microstructure on the plane S132, the reflected and diffracted light beam is emitted perpendicular to the plane S132, and the rest of the light energy is reflected and diffracted by the diffraction microstructure on the plane S132 and then continuously transmitted in the first expansion panel 13. Thus, the area of the light beams L1 and L2 which is transmitted and diffracted after each time of reaching the plane S131 of the first expansion panel 13 is denoted as B1, the area of the light beams L1 and L2 which is transmitted and diffracted after each time of reaching the plane S132 of the first expansion panel 13 is denoted as B2, and all the areas of B1 and B2 together constitute the expanded wide light beam output from the first expansion panel 13.
As shown in fig. 6, the plane S131 of the first expansion panel 13 has different transmission diffraction efficiency and zero order reflection diffraction efficiency in the Y direction divided regions, and the plane S132 has different zero order reflection diffraction efficiency and non-zero order reflection diffraction efficiency in the Y direction divided regions. The first area on the plane S131 near the light source module 11 is denoted as part11, each area is denoted as part12, part13, … …, part1i, … … along the negative Y direction, and the zero-order reflection diffraction efficiency of the part1i is denoted as R1i, and the transmission diffraction efficiency Dt1i. The first region on the plane S132 on the side away from the second expansion panel 15 is denoted as part21, each region is denoted as part22, part23, … …, part2i, … … in order along the negative Y direction, and the zeroth order reflection diffraction efficiency of the part2i is denoted as R2i, the transmission diffraction efficiency Dt2i. The total light energy emitted from the light source module 11 is denoted as E.
Irrespective of the absorption losses, it can be deduced here that: the final exit energy of the part1i region from the first expansion panel 13 is:
e11=dt11×e when i=1;
when i is equal to or greater than 2, e1i=dt1i×r11×r21×r12×r22× … … ×r1 (i-1) ×r2 (i-1) E.
Irrespective of the absorption losses, it can be deduced here that: the final exit energy of the part2i region from the first expansion panel 13 is:
when i=1, e21=r11×dd21×e;
when i is equal to or greater than 2, e2i=dt2i×r11×r21×r12×r22×r13× 13 … … ×r2 (i-1) r1i×e.
In order to obtain higher uniformity and higher energy utilization rate of the light beam emitted from the first expansion panel 13, the zero-order reflection diffraction efficiency, the non-zero-order reflection diffraction efficiency and the transmission diffraction efficiency of the multiple areas need to satisfy the following conditions:
E1i-E2i→0，i＝1：n (1)
E1i-E1j→0，i≠j，i＝1：n，j＝1：n (2)
E2i-E2j→0，i≠j，i＝1：n，j＝1：n (3)
that is, the transmission energy of the adjacent sections of the plane S131 and the plane S132 of the first expansion panel 13 tends to be the same, the transmission energy of each section of the plane S131 tends to be the same, the transmission energy of each section of the plane S132 tends to be the same, and the sum of the transmission energy of the plane S131 and the plane S132 of the first expansion panel 13 tends to be the total light energy emitted from the light source module 11.
As shown in fig. 5, when w=h×cos (β1), the beam output after the expansion of the first expansion panel 13 has higher light uniformity and no beam jump, and the regions B1 and B2 are seamlessly spliced. Wherein W is the beam caliber of the light source module 11 along the direction perpendicular to the incident direction of the light beam; h is the interval between the upper and lower planes of the first expansion panel 13 along the X direction; β1 is an angle between the parallel or near-parallel light beam output by the light source module 11 and the plane S131 of the first expansion panel 13.
Meanwhile, it can be deduced that when W < h×cos (β1), the parallel or near-parallel light beam output by the first expansion panel 13 has continuous light energy jump, and a gap is formed between the adjacent regions B1 and B2.
When W > H COS (β1), the parallel or near-parallel light beams output from the first expansion panel 13 exhibit a continuous light energy overlap region, with a light beam overlap region between the adjacent regions B1 and B2. An increase in light energy occurs in this overlap region, ultimately affecting the uniformity of the output beam.
The plane S131 of the first expansion panel 13 on the side close to the second expansion panel 15 and the plane S132 of the first expansion panel 13 on the side far from the second expansion panel 15 may be a hologram structure in addition to the diffraction microstructure.
The directional diffusion module 17 is disposed on the outgoing light path of the second expansion panel 15, and is an optical film material with a specific angle diffusion effect on the incoming light beam. The directional diffusion module 17 is configured to diffuse the outgoing light beam in two directions perpendicular to each other, and after the outgoing light beam is diffused by the directional diffusion module 17, the diffusion angle of the outgoing light beam in the vertical direction Y is between 0 ° and 30 °, and the diffusion angle of the outgoing light beam in the horizontal direction X is between 0 ° and 30 °, or the diffusion angles of the outgoing light beam in the two directions are different, for example, for a human eye pupil having a movement range in the horizontal direction X greater than that of the pupil in the vertical direction Y, the diffusion angle of the directional diffusion module 17 in the vertical direction Y may be set to be between 0 ° and 20 °, and the diffusion angle in the horizontal direction X is between 0 ° and 40 °. The directional diffusion module 17 may be an orthogonally placed double cylindrical lens array or a bi-directional diffusion film or an orthogonally placed unidirectional directional diffusion film. The unidirectional directional diffusion film may be a film having a certain morphology of distribution or a sequence of arrangement of micro-cylindrical lens structures on a film substrate, and the semi-spherical diameter of the micro-lens structures may be between several micrometers and hundred micrometers. The bi-directional diffusion film is generally a film having a morphology of distributed or sequentially arranged microlens structures on a film substrate, and the diameter of the semi-spheres of the microlens structures may be between several micrometers and hundred micrometers.
To reduce the volume, the directional diffusion module 17 may be attached to the second expansion panel 15.
According to the backlight module 10 provided by the preferred embodiment of the invention, the light beam caliber of the light beam output by the light source module 11 in the vertical and horizontal directions is expanded by using the first expansion panel 13 and the second expansion panel 15 through the integration and design of the light source module 11, the first expansion panel 13, the second expansion panel 15 and the directional diffusion module 17, so that the light source module 11 does not need to output a collimated wide light beam or a near-collimated wide light beam, the optical system structure of the light source module 11 is simpler, and meanwhile, the emergent light beam angle of the output light beam is controlled to be smaller by adopting the directional diffusion module 17, so that the light energy utilization rate of the backlight module 10 is greatly improved, the energy consumption is reduced and the stray light is reduced.
Referring to fig. 7, another embodiment of the present invention further provides an LCD display 1, which includes a liquid crystal panel 19 and the backlight module 10 described above.
The liquid crystal panel 19 is typically composed of a polarizer, a color filter, liquid crystal molecules, a thin film transistor, a polarizer.
In order to reduce the volume, the liquid crystal panel 19, the directional diffusion module 17, and the second expansion panel 15 may be bonded to each other two by two or three.
The LCD display 1 according to the preferred embodiment of the present invention includes the backlight module 10, and thus has similar beneficial effects.
The LCD display screen 1 provided by the embodiment of the invention can be applied to occasions with lower angles of view of the LCD display screen 1. For example, the LCD display 1 in the VR head display does not require a high angle of view, and thus the LCD display 1 can be applied to the VR head display.
Another preferred embodiment of the present invention further provides a VR head display, including the LCD display 1 described above.
The VR head display provided by the preferred embodiment of the present invention includes the LCD display 1 described above, so that it has similar beneficial effects, namely, improving light energy utilization, reducing energy consumption and reducing the generation of stray light.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The backlight module is characterized by comprising a light source module, a first expansion panel, a second expansion panel and a directional diffusion module;
the light source module is positioned on an incident light path of the first expansion panel, the second expansion panel is positioned on an emergent light path of the first expansion panel, and the directional diffusion module is positioned on the emergent light path of the second expansion panel;
the first expansion panel is provided with a diffraction microstructure or a holographic structure which plays a role in transmission diffraction on a plane S131 close to one side of the second expansion panel, the first expansion panel is provided with a diffraction microstructure or a holographic structure which plays a role in reflection diffraction on a plane S132 far away from one side of the second expansion panel, and the plane S131 is parallel to the plane S132;
the second expansion panel is provided with a diffraction microstructure or a holographic structure with a transmission diffraction effect on a plane S151 close to one side of the directional diffusion module, and the second expansion panel is provided with a diffraction microstructure or a holographic structure with a transmission diffraction effect on a plane S152 far away from one side of the directional diffusion module, wherein the plane S151 is parallel to the plane S152;
the collimation or near collimation illumination light beam provided by the light source module is transmitted and expanded in the vertical direction and the horizontal direction respectively through the first expansion panel and the second expansion panel to form a collimation wide light beam or a near collimation wide light beam, and the directional diffusion module controls the emergent light beam angle of the output light according to the preset vertical direction and the horizontal direction;
the transmission energy of the adjacent subareas of the plane S131 and the plane S132 of the first expansion panel tends to be the same, the transmission energy of each subarea of the plane S131 tends to be the same, the transmission energy of each subarea of the plane S132 tends to be the same, and the sum of the transmission energy of the plane S131 and the plane S132 of the first expansion panel tends to be the total light energy emitted by the light source module;
the first expansion panel is used for expanding an incident light beam in the Y direction, and the second expansion panel is used for expanding the incident light beam in the X direction, so that W=H is COSβ1;
wherein W is the aperture of the light source module along the direction perpendicular to the incident direction of the light beam; h is the distance between the upper and lower planes of the first expansion panel along the X direction; β1 is an included angle between the parallel or near-parallel light beam output by the light source module and the plane S131 of the first expansion panel;
the first expansion panel controls the emergent beam angle of the output light to be between 0 and 30 degrees in the vertical direction, and the second expansion panel controls the emergent beam angle of the output light to be between 0 and 30 degrees in the horizontal direction.
2. A backlight module according to claim 1, wherein the first expansion panel controls the outgoing beam angle of the outgoing light ray to be between 0 ° and 20 ° in the vertical direction, and the second expansion panel controls the outgoing beam angle of the outgoing light ray to be between 0 ° and 40 ° in the horizontal direction.
3. A backlight module according to any of claims 1-2, wherein the directional diffusion module is a bi-directional diffusion film, or a bi-cylindrical lens array placed orthogonally, or a uni-directional diffusion film placed orthogonally.
4. A backlight module according to any of claims 1-2, wherein the directional diffusion module is attached to the second expansion panel.
5. An LCD display screen, comprising a liquid crystal panel and the backlight module of any one of claims 1-4.
6. The LCD display screen of claim 5, wherein the liquid crystal panel, the directional diffusion module and the second expansion panel are attached to each other.
7. A VR head display comprising the LCD display of claim 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810701289.8A CN108594535B (en) | 2018-06-29 | 2018-06-29 | Backlight module, LCD display screen and VR head display |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810701289.8A CN108594535B (en) | 2018-06-29 | 2018-06-29 | Backlight module, LCD display screen and VR head display |
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| Publication Number | Publication Date |
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| CN108594535A CN108594535A (en) | 2018-09-28 |
| CN108594535B true CN108594535B (en) | 2023-12-26 |
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| CN111290128B (en) * | 2020-03-31 | 2021-10-01 | 京东方科技集团股份有限公司 | Optical system, display device and intelligent glasses |
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| CN108594535A (en) | 2018-09-28 |
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