CN110441855B - Front light panel with mixed dots - Google Patents
Front light panel with mixed dots Download PDFInfo
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- CN110441855B CN110441855B CN201910743840.XA CN201910743840A CN110441855B CN 110441855 B CN110441855 B CN 110441855B CN 201910743840 A CN201910743840 A CN 201910743840A CN 110441855 B CN110441855 B CN 110441855B
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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
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
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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
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
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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
- G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
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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
- G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
- G02F1/1675—Constructional details
- G02F1/1677—Structural association of cells with optical devices, e.g. reflectors or illuminating devices
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Abstract
The invention provides a front light plate with mixed dots, which comprises a light incident surface, a light emergent surface, a lower surface, collimated dots and light-taking dots. The light incident surface is vertically adjacent to the light emergent surface and the lower surface, and the lower surface or the light emergent surface defines a first point distribution area and a second point distribution area which are partially overlapped to form a dot junction area towards the opposite direction by taking the adjacent edge of the light incident surface or the light emergent surface as a starting point. The collimation lattice points are distributed in the first distribution area. The light-taking mesh points are distributed in the second point distribution area, and the angle formed by the ring wall surface line segment and the central axis in the section of each light-taking mesh point is larger than the angle formed by the ring wall surface line segment and the central axis in the section of each collimation mesh point. The collimation lattice points and the light extraction lattice points in the lattice point junction area are distributed in a mutually staggered and penetrated mode. Therefore, the large-angle light emitting position is adjusted at the near light side of the front light plate, and hot spot flaws of users in the visual process are eliminated.
Description
Technical Field
The invention relates to the field of light guide assemblies, in particular to a front light plate with mixed dots.
Background
Light guide plates are widely used in the display field today as light sources for their excellent optical adjustment properties. The light guide plate is generally used in cooperation with a point light source such as an LED, and when light from the point light source enters the light guide plate, the light is guided by the light guide plate to form planar light emission, so that a display panel which cannot emit light by itself can display a picture. The light guide plate can be divided into a front light plate and a back light plate according to a display panel and a use mode of matching application, wherein the front light plate is a light guide component which is arranged in front of the display panel and can be directly observed by a user, and the back light plate is a light guide component arranged behind the display panel.
Although the front light plate and the backlight plate are both light-guiding plates, the development directions of the front light plate and the backlight plate are greatly different based on different installation modes and applications. In the backlight design, the primary requirement is to provide uniform and bright light emission, so that the conventional method mostly achieves the above-mentioned purpose by adjusting the size, shape or layout state of the dots, and the backlight is disposed on the back of the display panel and shielded, so that the state of the dots can be seen by naked eyes.
The light-emitting requirement of the front light plate is similar to that of the backlight plate, but the backlight plate is arranged at the front side of the display panel, so that the backlight plate is a component which can be directly seen by a user, and the technical means of the backlight plate cannot be completely applied to the field of the front light plate. Accordingly, various technical contents for adjusting the light-emitting uniformity and brightness of the front light panel have appeared, for example, taiwan patent document No. I507747, which discloses that the light guide plate, the adhesive layer for adhering the functional material layer and the functional material layer have different refractive indexes by disposing the functional material layer on the light guide plate to achieve the purpose of adjusting the light-emitting performance; or as the taiwan patent document No. I514602, the purpose of adjusting the light emitting performance is achieved by adding two transparent substrates on the light emitting surface of the front light panel; or as the taiwan patent document No. I518435, the whole brightness of the electrophoretic display is improved by adding a plurality of light convergence films with different refractive indexes in the front light module; or as the taiwan patent document No. I518564, a cladding layer is added on one side of the light guide plate, and a plurality of columnar structures are added on the other side of the light guide plate to improve the light guide rate of downward light guide; or as the taiwan patent document No. I580942, which is the technical content that the applicant of the present application proposed in the past, is a tool and method for testing a bare viewing plate, i.e. a front viewing plate, so as to facilitate the confirmation of dot design of the front viewing plate, and whether the required light-emitting performance such as the overall light-emitting uniformity and luminance can be achieved; taiwan patent document No. I588551, which is a technology proposed by the applicant of the present invention, discloses defining a design region with a certain length in a front light panel, and adjusting a layout density in each design region having a different distance from a light incident side through a single type of dots to make the front light panel emit light uniformly.
In the prior art of the above-mentioned various front light panel fields, the light emitting performance of the front light panel or the module is mostly adjusted by adding other structures such as film materials, plates, columnar structures, etc. Or as the patent application previously proposed by the applicant of the present application, the light emitting performance is adjusted by designing the density of a single dot structure in different areas, or a jig is used to check whether the light extraction capability design of the front light panel meets the requirement after the front light panel is designed, so as to produce and manufacture a better front light panel product.
In view of the above, the present inventors have made extensive experience in the related art and have made continuous conception and experiments to provide a front light panel with mixed dots to solve the disadvantages of the related products of the conventional front light panel.
Disclosure of Invention
An objective of the present invention is to provide a front light plate with mixed dots, which can shorten the reflection distance of the light near the light incident side by arranging two kinds of dots with different structures, so that the light emitted from the area near the light incident side is more uniform and in accordance with the requirement, and simultaneously, the uniformity of the whole emitted light is improved, and the bad visual changes caused by two kinds of dots when a user looks straight can be eliminated.
To achieve the above object, in one embodiment of the present invention, a front light plate with mixed dots for covering a front side of an electrophoretic display panel comprises: a light incident surface for receiving light; a light emergent surface vertically adjacent to the light incident surface for emitting light; a lower surface, which is arranged opposite to the light-emitting surface and vertically adjacent to the light-incident surface, and defines a first dot distribution area and a second dot distribution area towards the direction opposite to the light-incident surface by taking the edge adjacent to the light-incident surface as a starting point, wherein the first dot distribution area and the second dot distribution area are partially overlapped with each other to form a dot junction area; a plurality of collimation net points which are arranged in the first point arrangement area, and the arrangement density of the collimation net points is gradually increased towards the direction relative to the light incident surface; the light-taking mesh points are distributed in the second mesh point distribution area, the distribution density of the light-taking mesh points is gradually increased towards the direction opposite to the light inlet surface, and the included angle between the line segment of the cross section of each light-taking mesh point, which corresponds to the ring wall surface of the light-taking mesh point, and the central axis of each light-taking mesh point is larger than the included angle between the line segment of the cross section of each collimation mesh point, which corresponds to the ring wall surface of the collimation mesh point, and the central axis of each collimation mesh point; the lattice point junction area is provided with the collimation lattice points and the light-taking lattice points at the same time, and the collimation lattice points and the light-taking lattice points are distributed in a staggered and penetrated mode. Therefore, the uniform light emitting effect can be provided, the adverse visual effect caused by different net points when a user directly looks at the product can be eliminated, and a more excellent optical product can be provided.
In another embodiment, the present invention also discloses a front light plate with mixed dots for covering a front side of an electrophoretic display panel, comprising: a light incident surface for receiving light; a light-emitting surface vertically adjacent to the light-incident surface for emitting light, wherein the light-emitting surface defines a first dot distribution region and a second dot distribution region in a direction opposite to the light-incident surface from the edge adjacent to the light-incident surface, and the first dot distribution region and the second dot distribution region are partially overlapped with each other to form a dot junction region; a lower surface opposite to the light emergent surface and vertically adjacent to the light incident surface; a plurality of collimation net points which are arranged in the first point arrangement area, and the arrangement density of the collimation net points is gradually increased towards the direction relative to the light incident surface; the light-taking mesh points are distributed in the second mesh point distribution area, the distribution density of the light-taking mesh points is gradually increased towards the direction opposite to the light inlet surface, and the included angle between the line segment of the cross section of each light-taking mesh point, which corresponds to the ring wall surface of the light-taking mesh point, and the central axis of each light-taking mesh point is larger than the included angle between the line segment of the cross section of each collimation mesh point, which corresponds to the ring wall surface of the collimation mesh point, and the central axis of each collimation mesh point; the lattice point junction area is provided with the collimation lattice points and the light-taking lattice points at the same time, and the collimation lattice points and the light-taking lattice points are distributed in a staggered and penetrated mode. In this embodiment, the collimating dots and the light-extracting dots are disposed on the light-emitting surface, which can also have excellent uniformity of emitted light and eliminate the bad visual effect when the user looks straight.
Based on the two embodiments, in one embodiment, it is disclosed that the arrangement of the collimated dots in the dot intersection region is zigzag, and the arrangement of the light-extracting dots in the dot intersection region is zigzag relative to the collimated dots, so as to have better dot mixing efficiency.
In addition, in another embodiment, an angle formed between a line segment corresponding to the ring wall surface of the cross section of the light extraction dots and the central axis of the light extraction dots is between 70 and 80 degrees, so that light can penetrate through the adjustment of the light extraction dots to form a more uniform light emitting state.
In order to improve the light adjustment efficiency near the light incident side, to shorten the reflection distance and reduce the dark area, in one embodiment, an angle formed by a line segment corresponding to the ring wall surface of the cross section of the collimated dots and the central axis of the collimated dots is between 40 and 60 degrees.
Next, a following embodiment discloses that the collimation dots are concave structures formed by laser bombardment, which not only can make the collimation dots have rough surfaces to facilitate adjustment of light paths, but also can improve the overall processing speed and the processing accuracy of the dot shapes.
In summary, the front light panel with mixed dots disclosed by the present invention can effectively improve the light-emitting state of the near-incident side and the overall light-emitting uniformity by arranging two different dot structures, and simultaneously eliminate the bad visual presentation caused by the two dot distribution boundaries when the front light panel is directly viewed by a user by a special arrangement manner. Furthermore, the light adjustment effect can be further improved through the structural limitation conditions of the collimation mesh points and the light extraction mesh points, and in order to be beneficial to generating the collimation mesh points with rough surfaces and considering the processing speed and accuracy, the mode of forming the collimation mesh points by laser bombardment can be further selected. In addition, in order to reduce the obvious degree of the distribution boundary line of the collimation lattice points and the light extraction lattice points, the collimation lattice points and the light extraction lattice points in the lattice point boundary area can be distributed in a relative zigzag manner.
Drawings
Fig. 1 is a schematic view of a front light plate structure according to a preferred embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a front light plate-mounted electrophoretic display panel according to a preferred embodiment of the invention.
Fig. 3 is a schematic view of a front light plate structure according to another embodiment of the present invention.
Fig. 4 is a schematic view of a front light plate structure according to still another embodiment of the present invention.
Fig. 5 is a cross-sectional view of a front light plate-mounted electrophoretic display panel according to still another preferred embodiment of the present invention.
Description of the reference numerals
1 front light panel
10 light incident surface
11 first distribution area
12 light emitting surface
13 second distribution area
14 lower surface
15 dot junction area
16 collimated dots
18 light-taking mesh point
2 electrophoretic display panel
3 LED lamp strip
The angle formed by the line segment of the section of the theta 1 light-taking mesh point corresponding to the ring wall surface and the central axis of the light-taking mesh point
The angle formed by the line segment of the section of the theta 2 collimation lattice point corresponding to the ring wall surface and the central axis of the collimation lattice point
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
The application of the front light plate is different from the application of the back light plate, in order to provide direct view for users, the front light plate is not provided with a plate such as a diffusion sheet or a prism sheet to shield flaws, so the design must pay attention to more possible flaw details under direct view of users. For example, the backlight plate is located at a low-beam position on the side close to the light, especially in front of the LED, and dots are not designed to destroy total reflection and cause light emission unless a macroscopic large structure is introduced for destroying the light pattern and taking other consideration into consideration. Even more, it is proposed herein in the relevant U.S. patents as a smooth mirror-like surface. However, in order to solve the problem of collective shift (shift) of light rays after a light transmitting layer having a different refractive index, such as a touch panel or a protective cover, is attached to the front light panel, the present inventors have proposed in chinese patent publication No. CN106289728A that a low beam position on the light-receiving side of the front light panel must be designed with a constant density of dots.
Therefore, in order to improve the uniformity of the light emitted from the front light panel and avoid uneven appearance of over-brightness or over-darkness in a partial area, the inventor of the present invention has appreciated based on the experience of the front light panel design that the method of disposing a single dot pattern on the front light panel is not sufficient in the front light panel field, and especially a dark band is often generated in the area adjacent to the light incident side. The inventor of the present invention has conceived that the light emitting appearance of each region of the front light plate can be adjusted by arranging two different dot structures on the front light plate through continuous experiments, so that the front light plate can have excellent light emitting uniformity as a whole. The front light plate is arranged in front of the display panel and can be directly watched by a user, so that in the design, if the dot arrangement is taken as a main light emitting adjustment technical means, whether the dot structure on the front light plate can be seen under the direct vision of the user or the watching use is influenced by the arrangement state of the dots must be considered, so that the poor visual effect which can be watched by the user under the direct vision can be eliminated by utilizing a special arrangement mode under the condition that two kinds of dots are used. The technical features of the present invention will be described in detail below.
Please refer to fig. 1 and fig. 2, which are schematic cross-sectional views of a front light plate structure and a front light plate-mounted electrophoretic display panel according to an embodiment of the present invention. The invention discloses a front light plate 1 with mixed dots, which is used for covering an electrophoretic display panel 2 and comprises a light incident surface 10, a light emergent surface 12, a lower surface 14, a plurality of collimation dots 16 and a plurality of light extraction dots 18. In practical applications, for the convenience of assembling with the electrophoretic display panel 2, a frame structure is generally disposed on the light incident surface 10, and a transition region is formed in a part of the light emitting surface 12 region shielded by the frame, where the transition region refers to a region shielded by the frame rather than a region where a user views a picture, which is an existing technology in the field, and therefore, the description thereof is omitted here. The input surface 10 is for receiving light, such as light from an LED. The light-emitting surface 12 is vertically adjacent to the light-entering surface 10 for emitting light. The lower surface 14 is disposed opposite to the light emitting surface 12 and vertically adjacent to the light incident surface 10. The lower surface 14 defines a first dot distribution region 11 and a second dot distribution region 13 toward the light incident surface 10 from the edge adjacent to the light incident surface 10, and the first dot distribution region 11 and the second dot distribution region 13 are partially overlapped to form a dot intersection region 15. The dotted line shown in the figure is used to indicate the starting boundary of the second dotting area 13, and the central line is used to indicate the ending boundary of the first dotting area 11.
The collimation mesh points 16 are arranged in the first distribution area 11, the distribution density of the collimation mesh points 16 is gradually increased towards the direction relative to the light incident surface 10, in an implementation state, the collimation mesh points 16 have rough surfaces, and the collimation mesh points 16 can be of a concave structure. The light-extracting dots 18 are arranged in the second dot arrangement region 13, the light-extracting dots 18 can be of a concave structure, and an angle theta 1 formed by a line segment corresponding to the ring wall surface of the light-extracting dot 18 in the cross section of the light-extracting dot 18 and the central axis of the light-extracting dot 18 is larger than an angle theta 2 formed by a line segment corresponding to the ring wall surface of the collimation dot 16 in the cross section of the collimation dot 16 and the central axis of the collimation dot 16, so that the light-extracting dot 18 is in a smoother structural state compared with the collimation dot 16, as shown in fig. 2. Wherein, the dot junction area 15 is provided with the collimation dots 16 and the light extraction dots 18, and the collimation dots 16 and the light extraction dots 18 are arranged in a mutually crossed and penetrated state.
Accordingly, the light emitting effect of the front light plate 1 near the light incident side can be effectively improved and the overall uniformity can be improved by arranging two kinds of dots with different structural shapes on the front light plate 1. The light entering the front light plate 1 from the light incident surface 10 is guided by the collimating dots 16, so that the reflection distance of the light can be effectively shortened, that is, the optical path is shortened, and the light is emitted from the region more adjacent to the light incident surface 10, so as to eliminate the dark band phenomenon possibly generated in the region near the light incident side, and after the optical path is shortened, the length of the matched frame can be reduced, and the action region of the front light plate 10 for a user to watch is enlarged. The light-extracting dots 18 at the back can make the light be adjusted by the light-extracting dots 18 to form uniform light-emitting on the light-emitting surface 12, and the distribution density of the light-extracting dots 18 can be increased toward the side opposite to the light-entering surface 10, so that the region far away from the light source can have the light-emitting performance with the same brightness and uniformity. Aiming at the direct vision effect caused by the arrangement of two different mesh point structures, the problem is solved by the arrangement state that the collimation mesh points 16 and the light-taking mesh points 18 in the mesh point junction area 15 are mutually crossed and penetrated, wherein the mutually crossed and penetrated arrangement is that the collimation mesh points 16 in the mesh point junction area 15 are arranged in a way of slowly reducing the arrangement proportion towards the direction opposite to the light incident surface 10, the light-taking mesh points 18 in the mesh point junction area 15 are arranged in a manner of slowly increasing the distribution ratio towards the direction opposite to the light incident surface 10, so that the collimation dots 16 and the light-taking dots 18 are mutually staggered in the dot intersection region 15, and the collimation dots 16 penetrate among the light-taking dots 18, and the light-taking dots 18 penetrate among the collimation dots 16, so that when the front light panel 1 is applied, the user can not see obvious dot arrangement boundary lines and poor visual presentation caused by the two kinds of dots because of direct vision. Although the collimated dots 16 in the dot interface region 15 are arranged in a manner of slowly decreasing the arrangement ratio toward the direction opposite to the light incident surface 10, the arrangement density of the collimated dots 16 at this position is still higher than that of the region adjacent to the light incident surface 10, and the overall arrangement density in the dot interface region 15 is also higher than that of the region adjacent to the light incident surface 10. In addition, the rough surface of the collimation dots 16 can make use of the characteristic of the rough surface with more types of cross-sectional angles to disperse light and further atomize the boundary between the collimation dots 16 and the light extraction dots 18, so that the observation is more uniform. The sizes of the first dot arrangement region 11, the second dot arrangement region 13 and the dot intersection region 15 can be adjusted according to the environmental conditions of the subsequent application of the front light panel 1 and the matched scale of other components, so as to provide the best light emitting effect. It should be noted that the arrangement states of the collimation dots 16 and the light extraction dots 18 in the dot intersection region 15 and the dot structure modeling are shown for illustrative purposes only, so as to facilitate understanding of the technical features of the present invention, and do not represent the actual dot arrangement state and structure, and the dot arrangement state of the present invention is not limited thereto.
In the subsequent application, the front light panel 1 may be combined with the LED light bar 3 to form a front light module structure, and the front light panel 1 is assembled in front of the electrophoretic display panel 2, as shown in fig. 2. After the light of the LED light bar 3 enters the front light plate 1 through the light incident surface 10, a part of the light forms light in a short optical path on the light incident side in response to the collimating dots 16, and a part of the light forms uniform light emitting performance on the light emitting surface 12 as a whole in response to the light extracting dots 18. The front light plate 1 and the electrophoretic display panel 2 can be fixed by combining with each other through optical glue, and an optical component or a touch film or a protective cover (not shown) can be further stacked on the light-emitting surface 12 of the front light plate 1 to improve the protection efficiency of the front light plate 1. The above description is only one application of the front light panel 1 of the present invention, and is not intended to limit the use of the front light panel 1.
As shown in fig. 2, in order to facilitate the light to form uniform emergent light by the light responsive to the light-extracting dot 18 structure, an angle θ 1 formed by a line segment corresponding to the ring wall surface of the light-extracting dot 18 in the cross section of the light-extracting dot 18 and the central axis of the light-extracting dot 18 is, for example, between 70 degrees and 80 degrees. The light-extracting dot 18 structure within the above-mentioned angle range can form better light-guiding effect with respect to the light, and make the front light plate 1 keep better image contrast in the subsequent application. On the other hand, in order to make the light exiting from the area near the light incident side guided by the collimating dots 16 to have a better appearance, the structure of the collimating dots 16 may also be designed, for example, the angle θ 2 formed by the line segment corresponding to the ring wall surface of the collimating dots 16 in the cross section of the collimating dots 16 and the central axis of the collimating dots 16 may be between 40 degrees and 60 degrees. In the foregoing angle range, the collimating dots 16 can shorten the reflection distance of the light, and form light emission in the light emitting surface 12 region adjacent to the light incident surface 10, so as to eliminate the dark zone region of the front light plate 1 on the light incident side, and make the light emission of the front light plate 1 more uniform and flexible.
In addition, the collimating lattice points 16 can be a concave structure formed by laser bombardment, so as to have a rough surface meeting the light guiding requirement, and accordingly, the manufacturing process efficiency and the structure accuracy can be better, and the poor light guiding effect or even different light emitting states caused by the structural fall of the collimating lattice points 16 can be avoided. The advantage of the collimated dots 16 formed by laser bombardment is that the cross-section of the collimated dots 16 covers a large number of angles, thereby increasing the light divergence efficiency, and effectively atomizing the boundary between two kinds of dots on the front light panel 1 while shortening the light reflection distance of the collimated dots 16. If the front light plate is formed by injection molding of a mold processed by a point hitting machine or a cutter, the surface of the collimation lattice point 16 is smooth, and the directivity of the reflected light is strong.
Further, please refer to fig. 3, which is a schematic diagram of a front light plate structure according to another embodiment of the present invention. In order to make the distribution state of the dots in the dot intersection region 15 more uniform and prevent the light from forming a local too bright or too dark light emitting state, the arrangement of the collimating dots 16 in the dot intersection region 15 is zigzag, and the arrangement of the light-taking dots 18 in the dot intersection region 15 is zigzag relative to the collimating dots 16. Accordingly, when light enters the front light board 1, the light emitted from the dot junction region 15 is more smooth and uniform, and no obvious dot setting boundary is seen by a user.
Fig. 4 and 5 are a schematic diagram of a front light plate structure and a schematic cross-sectional diagram of a front light plate-mounted electrophoretic display panel according to still another embodiment of the present disclosure, and fig. 1 and 3 are also shown. In addition to the foregoing paragraphs, the lower surface 14 of the front light panel 1 defines the first dot distribution region 11, the second dot distribution region 13 and the dot intersection region 15, and the collimating dots 16 and the light-extracting dots 18 are distributed on the lower surface 11, the first dot distribution region 11, the second dot distribution region 13 and the dot intersection region 15 of the front light panel 1 of the present invention may also be defined on the light-emitting surface 12, so that the collimating dots 16 and the light-extracting dots 18 are formed on the light-emitting surface 12, and the following will describe the structural features of another embodiment of the present invention. In this embodiment, the front light panel 1 also has an incident surface 10, an emergent surface 12, a lower surface 14, a collimating dot 16 and a light-extracting dot 18. The light incident surface 10 is vertically adjacent to the light emitting surface 12 and the lower surface 14, and the light emitting surface 12 and the lower surface 14 are disposed opposite to each other. The light-emitting surface 12 uses the edge adjacent to the light-entering surface 10 as a starting point, and a first dot distribution region 11 and a second dot distribution region 13 are defined towards the direction opposite to the light-entering surface 10, and the first dot distribution region 11 and the second dot distribution region 13 are partially overlapped with each other to form a dot junction region 15. The collimating lattice points 16 are disposed in the first lattice point disposing region 11, i.e., on the light emitting surface 12, and the disposing density thereof gradually increases toward the direction opposite to the light incident surface 10, and the collimating lattice points 16 have a rough surface. The light-extracting dots 18 are arranged in the second dot arrangement region 13 and formed on the light-emitting surface 12, and an angle θ 1 formed by a line segment corresponding to the ring wall surface of the light-extracting dot 18 in the cross section of the light-extracting dot 18 and the central axis of the light-extracting dot 18 is larger than an angle θ 2 formed by a line segment corresponding to the ring wall surface of the collimation dot 16 in the cross section of the collimation dot 16 and the central axis of the collimation dot 16, as shown in fig. 5. Wherein, the dot junction area 15 is provided with the collimation dots 16 and the light extraction dots 18, and the collimation dots 16 and the light extraction dots 18 are arranged in a staggered and penetrated manner, as shown in fig. 4. It is to be recalled here that the arrangement states of the collimation dots 16 and the light extraction dots 18 shown in the dot intersection region 15 are only for illustrative purposes to facilitate understanding of the technical features of the present invention, and do not represent the actual arrangement state, and the arrangement state of the present invention is not limited thereto. The dotted line shown in the figure is used to indicate the starting boundary of the second dotting area 13, and the central line is used to indicate the ending boundary of the first dotting area 11.
In the invention, by arranging the dot mixing application means of two different dots on the front light plate 1, the integral light-emitting uniformity is improved, and poor vision caused by the two dots under the direct vision of a user is eliminated. The light entering the front light plate 1 from the light incident surface 10 is guided by the collimating dots 16, so that the reflection distance of the light can be effectively shortened, and the light is emitted in the area more adjacent to the light incident surface 10, thereby eliminating the dark bands. The light ray continuously contacts the light-extracting dots 18 in the forward direction, so that the light ray is adjusted by the light-extracting dots 18 to form uniform light emission on the light-emitting surface 12. The direct vision effect caused by the arrangement of two different dot structures is solved by the arrangement state that the collimation dots 16 and the light extraction dots 18 are mutually crossed and penetrated. In addition, the rough surface of the collimation dots 16 can make use of the characteristic of the rough surface with more types of cross-sectional angles to disperse light and further atomize the boundary between the collimation dots 16 and the light extraction dots 18, so that the observation is more uniform. For the rest of the detailed technical features, please refer to the above paragraphs, which are not repeated herein.
As shown in fig. 5, in this embodiment, an angle θ 1 formed by a line segment corresponding to the ring wall surface of the light-extracting mesh point 18 in the cross section of the light-extracting mesh point 18 and the central axis of the light-extracting mesh point 18 is between 70 and 80 degrees, so as to obtain a better light-extracting effect; the angle θ 2 formed by the line segment of the cross section of the collimation dot 16 corresponding to the ring wall surface and the central axis of the collimation dot 16 is between 40 degrees and 60 degrees, so as to improve the efficiency of adjusting the light near the light incident side, and improve the uniformity of the whole light output. In application, the front light plate 1 is disposed in front of the electrophoretic display panel 2 and bonded to each other by an optical adhesive, and the LED light bar 3 is disposed at a position corresponding to the light incident surface 10 of the front light plate 1. For the rest of the detailed technical features, please refer to the above paragraphs, which are not repeated herein.
In addition, in order to facilitate the rough surface of the collimation lattice point 16, the collimation lattice point 16 can be a concave structure formed by laser bombardment, and the overall process rate and the structure accuracy can be improved by the laser bombardment. For the rest of the detailed technical features, please refer to the above paragraphs, which are not repeated herein.
Referring to fig. 2, when the collimated dots 16 and the light-extracting dots 18 are formed on the light-emitting surface 12, the collimated dots 16 may be arranged in the dot intersection region 15 in a zigzag manner, and the light-extracting dots 18 may be arranged in the dot intersection region 15 in a zigzag manner opposite to the collimated dots 16, so as to eliminate the influence of the staggered arrangement region of the collimated dots 16 and the light-extracting dots 18 on the viewing of the user, and to make the boundary between the two kinds of dots more atomized. Although the collimating dots 16 and the light extracting dots 18 illustrated in fig. 2 are formed on the lower surface 14, the collimating dots 16 and the light extracting dots 18 are distributed in a zigzag manner as illustrated in fig. 2. It is to be recalled here that the arrangement states of the collimation dots 16 and the light extraction dots 18 shown in the dot intersection region 15 are only for illustrative purposes to facilitate understanding of the technical features of the present invention, and do not represent the actual arrangement state, and the arrangement state of the present invention is not limited thereto.
In summary, the front light panel with mixed dots disclosed by the present invention can effectively improve the light-emitting state of the near-incident side and the overall light-emitting uniformity by arranging two different dot structures, and meanwhile, the poor visual appearance caused by the two dot distribution boundaries when the front light panel is directly viewed by a user is eliminated by means of a special arrangement manner. It is particularly important to note that the present invention is in the field of front light panels, which is quite different from the design motivation and consideration of backlight panels that have requirements for uniform light emission and brightness of light emission, but because the backlight panel is disposed on the back side of the panel, some viewing defects can be masked by the panel and other components, and the front light panel is disposed on the front side of the panel and is the first line component for the user to operate and view, so that some slight structural defects may cause the user to see very obvious bright spots or bright lines. Accordingly, the design of the front light panel is difficult. Therefore, under such a severe constraint condition, a front light panel meeting the light-emitting requirement and not generating obvious visual defects for users can be designed, and due protection and encouragement need to be obtained, so as to be beneficial to providing a more excellent optical product.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. The utility model provides a preceding light sheet with mix net point for cover locate an electrophoresis display panel on, its characterized in that contains:
a light incident surface for receiving light;
a light emergent surface vertically adjacent to the light incident surface for emitting light;
a lower surface, which is arranged opposite to the light-emitting surface and vertically adjacent to the light-incident surface, and defines a first dot distribution area and a second dot distribution area towards the direction opposite to the light-incident surface by taking the edge adjacent to the light-incident surface as a starting point, wherein the first dot distribution area and the second dot distribution area are partially overlapped with each other to form a dot junction area;
a plurality of collimation net points which are arranged in the first point arrangement area, and the arrangement density of the collimation net points is gradually increased towards the direction relative to the light incident surface; and
the plurality of light-taking mesh points are arranged in the second point arrangement area, and the angle formed by the line segments of the cross sections of the light-taking mesh points, which correspond to the ring wall surfaces of the light-taking mesh points, and the central axis of the light-taking mesh points is larger than the angle formed by the line segments of the cross sections of the collimation mesh points, which correspond to the ring wall surfaces of the collimation mesh points, and the central axis of the collimation mesh points; the lattice point junction area is provided with the collimation lattice points and the light-taking lattice points at the same time, and the collimation lattice points and the light-taking lattice points are distributed in a staggered and penetrated mode.
2. The front light panel with mixed dots of claim 1, wherein the alignment of the collimated dots within the dot intersection region is zigzag, and the alignment of the light-extracting dots within the dot intersection region is zigzag with respect to the collimated dots.
3. The front light panel with mixed dots of claim 1, wherein an angle formed by a line segment corresponding to the ring wall surface of the light-extracting dots in the cross section of the light-extracting dots and the central axis of the light-extracting dots is between 70 and 80 degrees.
4. The front light panel with mixed dots of claim 1, wherein an angle formed by a line segment corresponding to the ring wall surface of the collimated dots in the cross section of the collimated dots and the central axis of the collimated dots is between 40 and 60 degrees.
5. The front light panel with mixed dots of claim 1, wherein the collimated dots are recessed structures formed by laser bombardment.
6. The utility model provides a preceding light sheet with mix net point for cover locate an electrophoresis display panel on, its characterized in that contains:
a light incident surface for receiving light;
a light-emitting surface vertically adjacent to the light-incident surface for emitting light, wherein the light-emitting surface defines a first dot distribution region and a second dot distribution region in a direction opposite to the light-incident surface from the edge adjacent to the light-incident surface, and the first dot distribution region and the second dot distribution region are partially overlapped with each other to form a dot junction region;
a lower surface opposite to the light emergent surface and vertically adjacent to the light incident surface;
a plurality of collimation net points which are arranged in the first point arrangement area, and the arrangement density of the collimation net points is gradually increased towards the direction relative to the light incident surface; and
the plurality of light-taking mesh points are arranged in the second point arrangement area, and the angle formed by the line segments of the cross sections of the light-taking mesh points, which correspond to the ring wall surfaces of the light-taking mesh points, and the central axis of the light-taking mesh points is larger than the angle formed by the line segments of the cross sections of the collimation mesh points, which correspond to the ring wall surfaces of the collimation mesh points, and the central axis of the collimation mesh points; the lattice point junction area is provided with the collimation lattice points and the light-taking lattice points at the same time, and the collimation lattice points and the light-taking lattice points are distributed in a staggered and penetrated mode.
7. The front light panel with mixed dots of claim 6, wherein the alignment of the collimated dots within the dot intersection region is zigzag, and the alignment of the light extraction dots within the dot intersection region is zigzag with respect to the collimated dots.
8. The front light panel with mixed dots of claim 6, wherein the angle formed by the line segment corresponding to the ring wall surface of the light-extracting dots in the cross section of the light-extracting dots and the central axis of the light-extracting dots is between 70 and 80 degrees.
9. The front light panel with mixed dots of claim 6, wherein the angle formed by the line segment corresponding to the ring wall surface of the collimated dots in the cross section of the collimated dots and the central axis of the collimated dots is 40-60 degrees.
10. The front light panel with mixed dots of claim 6, wherein the collimated dots are recessed structures formed by laser bombardment.
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| CN106186990A (en) | 2016-07-05 | 2016-12-07 | 深圳怡荣盛科技有限公司 | Environmental protection water suction sheet material preparation method and prepare the device systems of sheet material |
| CN111899661A (en) * | 2020-08-19 | 2020-11-06 | 苏州茂立光电科技有限公司 | Front light module and reflective display device thereof |
| CN112255829A (en) * | 2020-10-22 | 2021-01-22 | Tcl通讯（宁波）有限公司 | Display panel and display device |
| CN112859423A (en) * | 2021-02-08 | 2021-05-28 | 捷开通讯(深圳)有限公司 | Display assembly and display device |
| CN113985516B (en) * | 2021-11-03 | 2023-12-12 | 京东方科技集团股份有限公司 | Backlight source and display device |
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| TWI254815B (en) * | 2001-05-22 | 2006-05-11 | Nichia Corp | Guide-plate for a plane-luminous device |
| CN101339267B (en) * | 2007-07-04 | 2010-09-22 | 豪晶科技股份有限公司 | Multiple machining area combination method |
| CN202275180U (en) * | 2011-10-24 | 2012-06-13 | 深圳市华星光电技术有限公司 | Light guide plate, back light module group and liquid crystal display device |
| JP5877752B2 (en) * | 2012-04-12 | 2016-03-08 | 住友化学株式会社 | Method for manufacturing light guide plate |
| CN102768404A (en) * | 2012-07-30 | 2012-11-07 | 青岛海信电器股份有限公司 | Method for improving shadows, light guide plate and display device |
| CN203799042U (en) * | 2014-04-15 | 2014-08-27 | 瑞仪(广州)光电子器件有限公司 | Light guide plate, backlight module and display apparatus |
| CN203868951U (en) * | 2014-04-15 | 2014-10-08 | 瑞仪(广州)光电子器件有限公司 | Light guide plate, backlight source module and display device |
| CN105403950B (en) * | 2016-01-05 | 2019-11-12 | 京东方科技集团股份有限公司 | Light guide plate and preparation method thereof, array substrate and preparation method thereof and display device |
| CN105929479A (en) * | 2016-04-25 | 2016-09-07 | 上海向隆电子科技有限公司 | Front light plate and design method thereof |
| CN206920643U (en) * | 2017-06-09 | 2018-01-23 | 河源鑫智胜电子有限公司 | A kind of light guide plate |
| CN207440330U (en) * | 2017-11-21 | 2018-06-01 | 苏州天禄光科技股份有限公司 | A kind of light guide plate of multi-section display |
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