CN111367008B - Light guide plate and backlight module - Google Patents
Light guide plate and backlight module Download PDFInfo
- Publication number
- CN111367008B CN111367008B CN202010237616.6A CN202010237616A CN111367008B CN 111367008 B CN111367008 B CN 111367008B CN 202010237616 A CN202010237616 A CN 202010237616A CN 111367008 B CN111367008 B CN 111367008B
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- China
- Prior art keywords
- light guide
- electromagnet
- guide plate
- magnet
- reflective
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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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
- G02F1/133605—Direct backlight including specially adapted reflectors
Abstract
A light guide plate and a backlight module. The invention provides a light guide plate, which comprises a light guide substrate and is characterized in that a fixing layer is arranged below the light guide substrate, the whole lower side of the light guide plate is provided with dots, each dot comprises a reflective magnet, a bearing disc and an electromagnet group, the bearing disc is arranged in the light guide substrate, the reflective magnet is movably arranged in the bearing disc, the electromagnet group is arranged in the fixing layer, and the electromagnet group is used for driving the reflective magnet to move in the bearing disc so as to change the size of each dot.
Description
Technical Field
The invention relates to the field of electronic display equipment, in particular to a light guide plate and a backlight module.
Background
Liquid Crystal Displays (LCDs) are popular with users due to their small size, thin thickness, light weight, and low power consumption, and Display devices such as mobile phones and computers have been widely used with the development of Display technologies.
The light guide plate is one of the important components of the liquid crystal display, and the working principle is as follows: the light source enters the light guide plate from the side to generate countless total reflection lights, the total reflection lights are diffused to all angles when meeting the micro-structure mesh points to generate refraction lights and scattering lights, and the refraction lights and the scattering lights destroy the reflection conditions and are emitted from the front surface of the light guide plate, so that the whole light guide plate panel emits uniform and high-brightness lights.
The dots in the light guide plate of the prior art have the following defects:
1. the dots are generally arranged on the reflecting surface of the light guide plate substrate in a printing mode after the light guide plate substrate is molded, and the positions and the sizes of the printed dots are fixed and cannot be changed, so that the regional brightness of an LCM (LCD Module) cannot be changed;
2. the mesh points will fall off, and the falling mesh points will scratch the membrane (a part of the display module).
Disclosure of Invention
The present invention provides a light guide plate and a backlight module, which aims to overcome the defects of the background art, not only can control and change the size of a mesh point, but also can effectively prevent the mesh point from falling off.
The invention provides a light guide plate which comprises a light guide substrate and is characterized in that a fixing layer is arranged on one side of the light guide substrate, a plurality of mesh points are arranged in the light guide plate, each mesh point comprises a reflective magnet, a bearing disc and an electromagnet group, the bearing disc is arranged in the light guide substrate, the reflective magnet is movably arranged in the bearing disc, the electromagnet group is arranged in the fixing layer, and the electromagnet group is used for driving the reflective magnet to move in the bearing disc so as to change the size of each mesh point.
Furthermore, the electromagnet group is arranged opposite to the bearing disc and comprises an outer ring electromagnet and an inner ring electromagnet, the inner ring electromagnet is positioned in the middle of the electromagnet group, and the outer ring electromagnet surrounds the inner ring electromagnet.
Furthermore, the inner ring electromagnet is of a circular structure, and the outer ring electromagnet is of a circular ring structure.
Further, when the inner ring electromagnet is electrified, the electromagnet group drives the reflecting magnet to move towards the center close to the bearing disc; when the outer ring electromagnet is electrified, the electromagnet group drives the reflecting magnet to move towards the center far away from the bearing disc.
Further, the bearing plate is of a disc-shaped structure, each mesh point comprises a plurality of reflective magnets, and the plurality of reflective magnets are distributed in a circular shape around the center of the bearing plate.
Furthermore, the upper surface of the bearing disc is provided with a plurality of tracks for the plurality of reflective magnets to slide along the radial direction, each track is internally provided with one reflective magnet correspondingly, and the electromagnet group is used for driving the plurality of reflective magnets to slide in the corresponding tracks.
Furthermore, an inverted T-shaped chute is arranged in the track, and the lower end of the reflective magnet is of an inverted T-shaped structure and is clamped in the chute of the track.
Furthermore, the bearing disc is of a concave structure with the middle part being concave relative to the periphery, a cavity is formed between the concave surface of the bearing disc and the light guide substrate, and the reflecting magnet is located in the cavity.
Further, the surface of the reflecting magnet is of a non-smooth structure and is used for scattering the light source.
The invention also provides a backlight module comprising the light guide plate.
According to the light guide plate provided by the invention, the electromagnet group controls the movement of the reflective magnet, so that the size of the mesh points can be freely regulated and controlled, the regional brightness control is performed on an LCM, and meanwhile, the mesh points are effectively prevented from falling off, so that a membrane is prevented from being scratched.
Drawings
FIG. 1 is a schematic structural diagram of a light guide plate according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an electromagnet assembly according to an embodiment of the present invention;
FIG. 3a is a diagram illustrating a large dot state of a dot in an embodiment of the present invention;
FIG. 3b is a diagram illustrating a small dot state of a dot in the embodiment of the present invention;
FIG. 4a is a schematic diagram of a dot structure according to an embodiment of the present invention;
FIG. 4b is a schematic structural diagram of a guide rail according to an embodiment of the present invention;
fig. 4c is a schematic structural diagram of a reflective magnet according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, the light guide plate provided by this embodiment includes a light guide substrate 1, a fixing layer 3 is disposed on one side of the light guide substrate 1, a plurality of dots 2 are disposed in the light guide plate, each dot 2 includes a reflective magnet 21, a carrying tray 22 and an electromagnet group 23, the carrying tray 22 is disposed in the light guide substrate 1, the reflective magnet 21 is movably disposed in the carrying tray 22, the electromagnet group 23 is disposed in the fixing layer 3, and the electromagnet group 23 is used for driving the reflective magnet 21 to move in the carrying tray 22, so as to change the size of each dot 2.
Specifically, the light guide substrate 1 is generally made of optical acrylic/pc (polycarbonate) plate, which has the characteristics of high refractive index and no light absorption, and the light source is generally emitted from one side (left side or right side) of the light guide substrate 1, scattered by the dots 2 disposed in the light guide substrate 1 and then emitted from the front surface of the light guide plate, so that the whole light guide plate panel emits uniform and high-brightness light.
Preferably, the reflective magnet 21 is a permanent magnet (or called a natural magnet), the fixing layer 3 is disposed on the lower side of the light guide substrate 1, the fixing layer 3 can be made of acrylic or PC, the carrying tray 22 can also be made of acrylic or PC, the electromagnet groups 23 are fixedly disposed inside the fixing layer 3, the distance between the electromagnet groups 23 and the carrying tray 22 can be designed according to actual requirements, the distance between adjacent electromagnet groups 23 is considered according to the actual density of the dots 2, and the distance is not limited herein.
Preferably, the surface of the retro-reflective magnet 21 is of a non-smooth structure for scattering the light source. The surface of the reflection magnet 21 is made to be non-smooth, so that light can be reflected in various directions, thereby destroying the original reflection condition and enabling the light guide plate to uniformly emit light.
As shown in fig. 1 to 3b, the electromagnet group 23 is disposed opposite to the carrier tray 22, the electromagnet group 23 includes an outer ring electromagnet 231 and an inner ring electromagnet 232, the inner ring electromagnet 232 is located in the middle of the electromagnet group 23, and the outer ring electromagnet 231 surrounds the inner ring electromagnet 232. Because the position of the electromagnet group 23 in the fixed layer 3 is fixed and a space is arranged between the adjacent electromagnet groups 23, one electromagnet group 23 correspondingly controls one mesh point 2 and cannot influence each other.
Preferably, the outer ring electromagnet 231 has a circular ring structure, and the inner ring electromagnet 232 has a circular structure. The electromagnet group 23 is integrally formed in a circular shape, so that the movement of the reflection magnet 21 can be controlled conveniently, and other shapes can be considered according to requirements.
Further, as shown in fig. 3a and 3b, when the inner ring electromagnet 232 is energized, the electromagnet group 23 drives the reflection magnet 21 to move toward the center of the carrier tray 22; when the outer ring electromagnet 231 is energized, the electromagnet group 23 drives the reflection magnet 21 to move away from the center of the carrier tray 22.
Specifically, the outer ring electromagnet 231 and the inner ring electromagnet 232 are independently controlled to be electrified, and the magnetism of the upper ends of the outer ring electromagnet 231 and the inner ring electromagnet 232 after being electrified is the same, that is, after the outer ring electromagnet 231 and the inner ring electromagnet 232 are electrified, the magnetism of the upper ends of the two electromagnets is both an N pole or both an S pole, and the movement of the retro-reflective magnet 21 is controlled by utilizing the characteristic that the magnets attract each other in opposite directions.
Specifically, the electromagnet groups 23 of different mesh points 2 can be independently controlled to be electrified or electrified together according to actual requirements, and meanwhile, the electrification can be controlled by a printed circuit board. The electromagnet groups 23 of different halftone dots 2 can be independently controlled to be electrified to realize more functions (for example, the functions of different areas of the light guide plate with different brightness), but the manufacture and the control are relatively troublesome, and the electromagnet groups 23 of different halftone dots 2 are electrified together to realize simple manufacture but single function.
As shown in fig. 4a, the carrier plate 22 has a disc-shaped structure, each dot 2 includes a plurality of reflective magnets 21, and the plurality of reflective magnets 21 are distributed in a circular arrangement around the center of the carrier plate 22.
Furthermore, a plurality of tracks 221 for the plurality of reflective magnets 21 to slide are distributed on the upper surface of the carrier tray 22 along the radial direction, one reflective magnet 21 is correspondingly disposed in each track 221, and the electromagnet group 23 is used for driving the plurality of reflective magnets 21 to slide in the respective corresponding track 221.
Further, as shown in fig. 4b and 4c, an inverted "T" shaped sliding slot 222 is disposed in the track 221, and the lower end of the reflective magnet 21 is in an inverted "T" shaped structure and is clamped in the sliding slot 222 of the track 221.
Preferably, each of the supporting plates 22 is provided with a plurality of tracks 221, different tracks 221 are not communicated with each other at one end near the center of the supporting plate 22, when the light guide plate is used for a long time, the magnetic force of different parts of the electromagnet group 23 may change, the magnetic force distribution is not necessarily uniform, the reflective magnet 21 may be separated from the original track and run onto other tracks, thereby causing the light guide plate to be used in a failure, and the tracks 221 are not communicated with each other, thereby effectively limiting the movement track of the reflective magnet 21.
Meanwhile, the lower end of the reflective magnet 21 is clamped in the sliding groove 222 of the track 221, so that the movement track of the reflective magnet 21 can be effectively limited, and the reflective magnet 21 is prevented from falling off from the bearing disc 22 to influence the use effect.
As shown in fig. 3a and 3b, the carrier tray 22 is a concave structure with a concave center relative to the periphery, a cavity 12 is formed between the concave center of the carrier tray 22 and the light guide substrate 1, and the reflective magnet 21 is located in the cavity 12, so that the reflective magnet 21 can move in the cavity 12.
Specifically, the cavity 12 is sized to accommodate at least the upper end of the retro-reflective magnet 21 not to collide with the light guide substrate 1 when the retro-reflective magnet 21 slides on the guide rail 221.
Preferably, the upper ends of the respective reflection magnets 21 have the same magnetism, the lower ends of the respective reflection magnets 21 have the same magnetism, the upper and lower ends of each reflection magnet 21 have different magnetism, and the magnetism of the lower end of the reflection magnet 21 is opposite to that of the upper end of the electromagnet group 23.
Fig. 3a and 3b are schematic diagrams of the halftone dots 2 in different states, wherein fig. 3a is a large halftone dot state, and fig. 3b is a small halftone dot state.
Specifically, as shown in fig. 3a, when the light guide plate is in operation, the outer ring electromagnet 231 is energized with magnetism, and the inner ring electromagnet 232 is not energized with magnetism, and the magnetism at the lower end of the reflective magnet 21 is opposite to the magnetism at the upper end of the outer ring electromagnet 231, so that under the attraction of the magnetic force of the outer ring electromagnet 231, the reflective magnet 21 slides to a position close to the outer ring electromagnet 231, and a large-dot state shown in fig. 3a is obtained; when the outer ring electromagnet 231 is not energized and the inner ring electromagnet 232 is energized, the magnetism of the lower end of the reflection magnet 21 is opposite to the magnetism of the upper end of the inner ring electromagnet 232, so that the reflection magnet 21 slides to a position close to the inner ring electromagnet 232 under the attraction of the magnetic force of the inner ring electromagnet 232, and a state of small dots as shown in fig. 3b is obtained.
Meanwhile, the magnetic force of the outer ring electromagnet 231 and the inner ring electromagnet 232 can be controlled by controlling the magnitude of the current, so that the position of the reflecting magnet 21 can be controlled. For example, when the current passing through the inner ring electromagnet 232 is small and the magnetism is small, the attraction force to the reflective magnets 21 is small, the distance between the reflective magnets 21 is large, and the mesh point is large; when the magnetism of the inner ring electromagnet 232 is large, the attraction force to the reflective magnets 21 is large, the space between the reflective magnets 21 is small, and the mesh point is small. On the basis, the function of different brightness of different areas of the module can be realized by controlling the sizes of the screen dots 2 in different areas.
It should be noted that, if the magnetism at the lower end of the reflective magnet 21 is the same as the magnetism at the upper end of the electromagnet group 23, that is, the movement of the reflective magnet 21 is controlled by the principle of like poles repelling each other, the dot 2 is not easily realized when the dot state is changed from the large dot state to the small dot state, and the reflective magnet 21 is easily caught in the guide rail 221 and does not slide, so that the function of the light guide plate that can change the dot size is disabled.
Meanwhile, in the same bearing disc 22, if the magnetism of the upper and lower ends of all the reflective magnets 21 is not the same (for example, the upper end of one reflective magnet 21 is an N pole, the lower end of the other reflective magnet 21 is an S pole, and the upper end of the other reflective magnet 21 is an S pole, and the lower end of the other reflective magnet 21 is an N pole), when the electromagnet group 23 is energized, the motion trajectories of the reflective magnets 21 are different, the positions of the reflective magnets 21 cannot be effectively controlled, and the desired dot sizes cannot be obtained; if the upper and lower ends of all the reflective magnets 21 are not the same (e.g., the upper ends of all the reflective magnets in the No. 1 carrier are N-pole and the lower ends thereof are S-pole, and the upper ends of all the reflective magnets in the No. 2 carrier are S-pole and the lower ends thereof are N-pole) between different carriers 22, the polarities of the upper and lower ends of the corresponding electromagnet groups need to be changed, and the control logic needs to be changed, which is not convenient for the manufacture and control of the light guide plate.
The invention has the advantages that:
1. the distribution of the reflecting magnets 21 is controlled by controlling the electromagnet group 23, so that the size of the screen point 2 is freely regulated and controlled, and the regional brightness control is performed on an LCM (LCD Module) by controlling the size of the screen point 2;
2. effectively preventing the mesh point 2 from falling off and scratching the membrane (not shown). The mesh points 2 in the light guide plate in the prior art can fall off under the action of external force, enter the membrane part in the module and scratch the membrane, the reflective magnet 21 is prevented from falling off by clamping the reflective magnet 21 in the track 221, and meanwhile, the whole mesh points 2 are sealed in the light guide substrate 1 and the fixed layer 3, so that the mesh points 2 cannot be separated from the light guide substrate 1 even if falling off, and the membrane is effectively protected.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. A light guide plate comprises a light guide substrate (1) and is characterized in that a fixing layer (3) is arranged on one side of the light guide substrate (1), a plurality of mesh points (2) are arranged in the light guide plate, each mesh point (2) comprises a reflecting magnet (21), a bearing disc (22) and an electromagnet group (23), the bearing disc (22) is arranged in the light guide substrate (1), and the reflecting magnet (21) is movably arranged in the bearing disc (22); the bearing disc (22) is of a disc-shaped structure, each mesh point (2) comprises a plurality of reflecting magnets (21), and the plurality of reflecting magnets (21) are distributed in a circular shape around the center of the bearing disc (22); the electromagnet group (23) is arranged in the fixed layer (3), and the electromagnet group (23) is used for driving the plurality of reflecting magnets (21) to move in the bearing disc (22) so as to change the distance between the plurality of reflecting magnets (21) and further change the size of each mesh point (2).
2. The light guide plate according to claim 1, wherein the electromagnet group (23) is disposed opposite to the carrier tray (22), the electromagnet group (23) includes an outer ring electromagnet (231) and an inner ring electromagnet (232), the inner ring electromagnet (232) is disposed at a middle portion of the electromagnet group (23), and the outer ring electromagnet (231) surrounds the inner ring electromagnet (232).
3. The light guide plate according to claim 2, wherein the inner ring of electromagnets (232) has a circular structure and the outer ring of electromagnets (231) has a circular ring structure.
4. The light guide plate according to claim 2, wherein when the inner ring electromagnet (232) is energized, the electromagnet group (23) drives the reflection magnet (21) to move toward the center near the carrier tray (22); when the outer ring electromagnet (231) is electrified, the electromagnet group (23) drives the reflecting magnet (21) to move towards the center far away from the bearing disc (22).
5. The light guide plate according to claim 1, wherein the upper surface of the carrier plate (22) is provided with a plurality of tracks (221) along a radial direction for the plurality of reflective magnets (21) to slide, one reflective magnet (21) is correspondingly arranged in each track (221), and the electromagnet sets (23) are used for driving the plurality of reflective magnets (21) to slide in the respective corresponding tracks (221).
6. The light guide plate according to claim 5, wherein the rail (221) has an inverted T-shaped slot (222), and the lower end of the reflective magnet (21) has an inverted T-shaped structure and is engaged with the slot (222) of the rail (221).
7. The light guide plate according to claim 1, wherein the carrier plate (22) has a concave structure with a concave center portion recessed with respect to the periphery, a cavity (12) is formed between the concave center portion of the carrier plate (22) and the light guide substrate (1), and the reflective magnet (21) is located in the cavity (12).
8. The light guide plate according to claim 1, wherein the surface of the light reflecting magnet (21) is a non-smooth structure for scattering the light source.
9. A backlight module comprising the light guide plate according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010237616.6A CN111367008B (en) | 2020-03-30 | 2020-03-30 | Light guide plate and backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010237616.6A CN111367008B (en) | 2020-03-30 | 2020-03-30 | Light guide plate and backlight module |
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| Publication Number | Publication Date |
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| CN111367008A CN111367008A (en) | 2020-07-03 |
| CN111367008B true CN111367008B (en) | 2022-04-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104115335A (en) * | 2009-02-02 | 2014-10-22 | 艾派克斯技术股份有限公司 | Flexible magnetic interconnects |
| CN205862729U (en) * | 2016-04-14 | 2017-01-04 | 张清华 | A kind of display device of Electromagnetic Control |
| CN106932853A (en) * | 2016-11-25 | 2017-07-07 | 上海三思电子工程有限公司 | Light guide plate method for designing and light guide plate, network point distribution method and ligthing paraphernalia |
| CN206479669U (en) * | 2017-02-16 | 2017-09-08 | 京东方科技集团股份有限公司 | A kind of film layer, light guide plate assembly, backlight module and display device |
| CN108680984A (en) * | 2018-05-18 | 2018-10-19 | 重庆京东方显示照明有限公司 | Light guide plate and its control method, backlight module, display device |
-
2020
- 2020-03-30 CN CN202010237616.6A patent/CN111367008B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104115335A (en) * | 2009-02-02 | 2014-10-22 | 艾派克斯技术股份有限公司 | Flexible magnetic interconnects |
| CN205862729U (en) * | 2016-04-14 | 2017-01-04 | 张清华 | A kind of display device of Electromagnetic Control |
| CN106932853A (en) * | 2016-11-25 | 2017-07-07 | 上海三思电子工程有限公司 | Light guide plate method for designing and light guide plate, network point distribution method and ligthing paraphernalia |
| CN206479669U (en) * | 2017-02-16 | 2017-09-08 | 京东方科技集团股份有限公司 | A kind of film layer, light guide plate assembly, backlight module and display device |
| CN108680984A (en) * | 2018-05-18 | 2018-10-19 | 重庆京东方显示照明有限公司 | Light guide plate and its control method, backlight module, display device |
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| CN111367008A (en) | 2020-07-03 |
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