CN111025451A - Mesh point design method for changing integral density ratio of light guide plate aiming at hot pressing process - Google Patents
Mesh point design method for changing integral density ratio of light guide plate aiming at hot pressing process Download PDFInfo
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- CN111025451A CN111025451A CN201911084965.2A CN201911084965A CN111025451A CN 111025451 A CN111025451 A CN 111025451A CN 201911084965 A CN201911084965 A CN 201911084965A CN 111025451 A CN111025451 A CN 111025451A
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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
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Abstract
The invention relates to the technical field of light guide plate mesh point design, in particular to a mesh point design method for changing the whole density ratio of a light guide plate aiming at a hot pressing process, wherein the mesh point design method is realized by changing the whole density ratio of an initial light guide plate according to a specific density curve equation, the density curve equation of the initial light guide plate is A, and the density curve equation is changed according to a density curve equation B or a density curve equation C; the invention not only effectively solves the problem that black and white stripe phenomenon is easy to occur in the hot pressing process due to too small density of the mesh points or the problem that the processing fraction defective is improved due to the fact that the pressure is increased in the production process due to too large density of the mesh points, but also ensures that the light guide plate after mesh point adjustment is suitable for different types of hot presses with inconsistent limit pressure, so that the same product achieves the same brightness presentation under the design of different density ratio trends, the optical design of the light guide plate is more diversified, and the restriction factor of development is reduced.
Description
Technical Field
The invention relates to the technical field of light guide plate mesh point design, in particular to a mesh point design method for changing the integral density ratio of a light guide plate by aiming at a hot pressing process.
Background
The light guide plate is used as a core component of an ELED side-entry flat panel display and is used for converting an LED line light source into an overall planar light source. The current manufacturing process of the light guide plate mainly comprises four processes of hot pressing, printing, laser and ejection, wherein the hot pressing process occupies the largest market proportion by virtue of high stability, high productivity, no pollution, strong reliability and the like. The principle of the hot pressing process is mainly that a mould is heated, then the mould is contacted with the surface of the light guide plate under the condition of high temperature, and certain pressure is applied, so that the mechanical structure transfer is carried out on the surface of the light guide plate. However, the hot pressing process is prone to black and white stripe phenomenon caused by too low dot density, the macroscopic visual effect cannot reach the standard, and the process fraction defective is also prone to be increased due to increased pressure caused by too high dot density in the production process.
In order to solve the two defects in the hot pressing process, the prior art respectively improves the treatment by the following modes:
1. aiming at the phenomenon of black and white stripes caused by over-low density, by adding a film (mainly a diffusion film) of the backlight module of the ELED flat panel display, mesh points can be atomized, the black and white stripes can be weakened, and the shielding property can be improved. However, the treatment method needs to add a membrane to achieve visual effect, and increases cost and additional processes, wherein the addition of one process flow can directly increase the reject ratio of the product.
2. The improvement of the poor process caused by the excessive density is treated in two ways, namely, the pressure of a machine under the production state is increased, and the complete transfer is ensured. However, the pressure of the machine is limited, when the pressure of the machine is increased, the gap between the upper roller 1 and the lower roller 2 is reduced, so that the deformation of the pressure spring 3 under the pressure is increased, and a larger rebound pressure is provided, and the pressure spring 3 is continuously produced under a high pressure state, so that the metal fatigue phenomenon is easily generated, the service life of the machine is reduced, and the production instability is increased (as shown in fig. 1).
Secondly, the temperature of the roller on the machine is changed for processing, because the mesh point structure on the die is easier to be transcribed on the surface of the light guide plate under the condition of high temperature, the mesh point structure with higher density needs higher temperature to be transcribed under the condition of unchanged control pressure. At present, the production temperature of an MS plate of a hot press machine is controlled to be 110-125 ℃, the production temperature of a PMMA plate is controlled to be 110-135 ℃, when the temperature is lower than the temperature, the mesh points are difficult to completely transcribe and cannot reach the standard of macroscopic visual effect (such as complete transcription mesh points 4 and incomplete transcription mesh points 5 shown in figure 2), but if the temperature is higher than the temperature range, the temperature exceeds the heat resistance limit temperature of the material, and the macroscopic yellowing phenomenon occurs. Therefore, the processing method has design limitation, the temperature control range is small, and the reject ratio of the corresponding phenomenon can be improved at the edge of the temperature range.
Aiming at solving the defects of black and white stripe phenomenon caused by over-low mesh point density and poor processing improvement caused by over-high mesh point density in the hot pressing process in the prior art, the invention provides a mesh point design method capable of effectively solving the technical problems.
Disclosure of Invention
The invention aims to solve the technical problem of designing a dot design method for changing the integral density ratio of a light guide plate according to a specific rule so as to solve the problems in the hot pressing process.
The invention is realized by the following technical scheme:
a design method of mesh points aiming at a hot pressing process to change the whole density ratio of a light guide plate is realized by changing the whole density ratio of an initial light guide plate according to a specific density curve equation, the density curve equation of the initial light guide plate is A, and the whole density of the light guide plate is increased according to a density curve equation B or the whole density of the light guide plate is reduced according to a density curve equation C;
the density curve equation B and the density curve equation C are established by the following steps:
(1) setting the total length of the light guide plate from the light incident bottom surface to the light emergent top surface as H, setting the width of the bottom surface of the light guide plate as L and the body x as any value in 0-H, and setting the density ratio of any point position on the light guide plate as HRepresents;
(2) if the density ratio change of a single optical path from (x, 0) to (x, H) is set as a curve Ax at any point (x, 0), the density ratio of Ax to the light entrance end is;
Setting the single-optical path density ratio change of the density curve equation B as a curve Bx, wherein the density ratio of Bx incident light starting end isWhereinSetting the constant a as a numerical value in a range of 110% -130%;
setting the single-optical path density ratio change of the density curve equation C as a curve Cx, so that the density ratio of Cx incident light starting end isWhereinSetting the constant b as a numerical value in the range of 70-90%;
(3) on the Ax curve, any point is taken as a coordinate xy, and the density of the corresponding initial light guide plate is,
When the overall density of the initial light guide plate is to be increased, it is changed by the density curve equation B:
when the overall density of the initial light guide plate is to be reduced, it is changed by the density curve equation B:
further, the calculation formula of the density ratio of the light guide plate is as follows:in which S is1The area of a single mesh point, n is the total number of the mesh points in the area of the light guide plate, and S is the area of the light guide plate.
Further, the density ratio of the light guide plate on the light guide plateThe increasing trend is shown from the light incidence side to the light emergence side, and the increasing curve is nonlinear.
Further, the light guide plate uses an LED lamp as a light source.
Has the advantages that:
(1) according to the invention, the integral mesh point density of the light guide plate is increased according to the density curve equation B, so that the macroscopic visual effect of the ELED lateral entrance type flat panel display can be effectively improved; on the contrary, the density of the whole lattice points of the light guide plate is reduced according to the density curve equation C, so that the production pressure of a hot press machine can be effectively reduced, the product yield is improved, and the service life of the machine is prolonged;
(2) the invention solves the problem of optical development of the light guide plate in the industry, and the integral density ratio of the mesh points of the light guide plate is adjusted according to the density curve equation B or the density curve equation C of the invention, so that the light guide plate after mesh point adjustment is suitable for different types of hot presses with inconsistent limit pressure, thereby leading the same product to achieve the same brilliance presentation under the design of different density ratio trends, leading the optical design of the light guide plate to be more diversified, and reducing the restriction factor of development.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional machine for hot-pressing a light guide plate;
FIG. 2 is a comparison diagram of completely transferred dots and incompletely transferred dots in a hot-pressing process of a light guide plate;
FIG. 3 is a graph showing a density curve of a conventional light guide plate;
FIG. 4 is a sectional view of the area of the light guide plate in the dot design;
fig. 5 is a graph of A, B, C three density plots in a dot density design.
1-upper roller, 2-lower roller, 3-pressure spring, 4-complete transfer lattice point and 5-incomplete transfer lattice point.
Detailed Description
The embodiment of the invention provides a mesh point design method for changing the whole density ratio of a light guide plate aiming at a hot pressing process, and aims to solve the problems that in the hot pressing process of the light guide plate, the black and white stripe phenomenon is caused by too low mesh point density, and the processing procedure is not good caused by too high mesh point density.
In order to make the objects, features and advantages of the present invention more obvious and understandable, 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, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for designing the mesh points comprises the following specific steps:
firstly, using LED lamps as light sources, setting the density ratio of the light guide plate as rho, the area of a single mesh point as S1, the number of the mesh points in the area of the light guide plate as n, and the sum of the areas of the mesh points in the area of the light guide plate as nThe area of the region on the light guide plate is S, the density ratio of the light guide plate;
Secondly, according to the density design rule of the mesh points on the existing light guide plate, namely rho presents an increasing trend from the incident light side to the emergent light side, and the density ratio of the mesh points presents an increasing curve state from a certain straight line from the incident light side to the emergent light side, wherein the curve is a density curve graph (as shown in fig. 3);
setting the total length of the light guide plate from the light incident bottom surface to the light emergent top surface to be H, and dividing the light guide plate into M grids according to design requirements; setting the width of the bottom surface of the light guide plate to be L, dividing the light guide plate into N grids according to design requirements (as shown in FIG. 4), and setting the density ratio of any point on the light guide plate toRepresents;
and thirdly, the density curve of the existing light guide plate is A, the density curve after increasing is B, and the density curve after decreasing is C. To ensure consistent optical effects, the A, B, C density curves were transformed by the following method (three of which are shown in FIG. 5):
1) setting a curve Ax by changing the density ratio of a single optical path from (x, 0) to (x, H) at any point (x, 0) on the curve A, so that the density ratio of the mesh points at the starting end of the light incident on Ax isOn the density curve B, the value isSetting a point value as a within the range of 110% -130%; on the density curve C then corresponds toSetting a point value as b within the range of 70% -90%;
2) then, a point (x, y) is arbitrarily selected from the curve A, and the dot density ratio of the point isAt this time, the corresponding density curve B is:;
3) according to the grid density corresponding to the density curve B at the (x, y) point, the density ratio of the light-emitting end can be correspondingly converted intoWherein;
According to the grid density corresponding to the density curve C at the (x, y) point, the density ratio of the light-emitting end can be correspondingly converted intoWherein;
4) Corresponding to a density curve B having a minimum density ratio ofMaximum density ratio ofThe corresponding density curve C has a minimum density ratio ofMaximum density ratio ofHere, the minimum density ratio on the two curves B and C isMaximum density ratio ofWherein the minimum dot density ratioMaximum density for evaluation of the value of black and white specklesRatio ofThe values of a and b in the operation process are values in respective ranges according to experiments and empirical values, which are the decisive factors for overlarge pressure of a machine.
5) Finally, after the values a and b are determined, the density distribution of the whole light guide plate can be calculated through the conversion relation, so that the purpose of optical design is achieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A design method of mesh points aiming at changing the whole density ratio of a light guide plate by a hot pressing process is realized by changing the whole density ratio of an initial light guide plate according to a specific density curve equation, and is characterized in that the density curve equation of the initial light guide plate is A, and the whole density of the light guide plate is increased according to a density curve equation B or the whole density of the light guide plate is reduced according to a density curve equation C;
the density curve equation B and the density curve equation C are established by the following steps:
(1) setting the total length of the light guide plate from the light incident bottom surface to the light emergent top surface as H, setting the width of the bottom surface of the light guide plate as L and the body x as any value in 0-H, and setting the density ratio of any point position on the light guide plate as HRepresents;
(2) if the density ratio change of a single optical path from (x, 0) to (x, H) is set as a curve Ax at any point (x, 0), the density ratio of Ax to the light entrance end is;
Setting the Single optical Density of the Density Curve equation BThe variation of the intensity ratio is set as a curve Bx, and the intensity ratio of Bx to the light incident start end isWhereinSetting the constant a as a numerical value in a range of 110% -130%;
setting the single-optical path density ratio change of the density curve equation C as a curve Cx, so that the density ratio of Cx incident light starting end isWhereinSetting the constant b as a numerical value in the range of 70-90%;
(3) on the Ax curve, any point is taken as a coordinate xy, and the density of the corresponding initial light guide plate is,
When the overall density of the initial light guide plate is to be increased, it is changed by the density curve equation B:
when the overall density of the initial light guide plate is to be reduced, it is changed by the density curve equation B:
2. a dot design method for changing the overall density ratio of a light guide plate according to claim 1, wherein: the calculation formula of the density ratio of the light guide plate is as follows:in which S is1The area of a single mesh point, n is the total number of the mesh points in the area of the light guide plate, and S is the area of the light guide plate.
3. A dot design method for changing the overall density ratio of a light guide plate according to claim 2, wherein: density ratio of the light guide plate on the light guide plateThe increasing trend is shown from the light incidence side to the light emergence side, and the increasing curve is nonlinear.
4. The dot design method for changing the overall density ratio of the light guide plate according to any one of claims 1 to 3, wherein: the light guide plate takes an LED lamp as a light source.
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CN114692483A (en) * | 2022-02-14 | 2022-07-01 | 苏州欧匹希光电有限公司 | Intelligent design method and system for light guide plate |
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