TW200424565A - Light guide plate - Google Patents

Abstract

A light guide plate molded by using a transparent resin, the obverse face of the plate being a light emitting face and at least two opposite faces of four lateral sides of the plate being light incident faces and reverse face of the plate being the light reflecting face which is formed in such a manner that the thickness of the plate gradually decreases in the direction from the light incident faces toward the central portion of the plate. The light guide plate of the present invention is excellent in lightweight, high luminance and uniformity of luminance.

Description

200424565 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a light guide plate. More specifically, the present invention relates to a light guide plate that is light-weight, has a high brightness, a small brightness unevenness, and a good brightness uniformity. [Prior art] Liquid crystal display devices are widely used for display of personal computers, thin televisions, and satellite navigation systems. In the liquid crystal display device, a light guide plate that converts light from a light source such as a cold cathode discharge tube provided on a side surface into planar light is used. The light guide plate obtains a high brightness, makes full use of the light from the light source, and has no uneven brightness. The light from the light source is uniformly irradiated to the liquid crystal. Therefore, various improvements have been made in the shape of the light guide plate. For example, it is proposed to adjust the reflection surface to improve the uniformity of brightness, and to be a redundant light guide plate. On the back, a reflection process that changes the reflectance according to the distance from the light source is directly applied. Linear light-cut light guide plate (Patent Document 丨). In addition, it is mentioned that the light guide plate, which is a lightweight and thin structure that improves light utilization efficiency, has a convex lens L at the side that is approximately parallel to the light from the light source, and also has light that is introduced in parallel in incidence. The light guide plate in which the light diffusing layer is provided by pouring into the outer side of the inclined surface (patent document μ 镝 is that the brightness and the brightness uniformity of these light guide plates are unsatisfactory. J "From the object of the present invention, a system is provided Lightweight, light-weight light guide plate with less unevenness and good brightness uniformity. Redundancy becomes high and bright

2219-6203-PF (N2); Ahddub.ptd Page 7 200424565 V. Description of the invention (2) [Patent Document 1 _ Japanese Patent Application Laid-Open No. 5-2 03947 [Patent Document 2] Japanese Patent Laid-Open No. 6_16〇638 Bulletin (Page 2 and Figure) [Summary of the Invention] In order to solve the above-mentioned problems, the researchers have repeatedly researched the shape of the transparent arrogance. Now they have become a board with a surface, a back, and four sides. + Opposite ^, the shape and the surface become the light exit surface, the solid water surface of one or two of the four side faces becomes the light incidence surface, and the back surface is formed by the light incidence surface guide plate system as: iu;:> 3. The light reflection surface of the light is good; according to this opinion, the brightness is reduced, and the brightness is uniform. That is, the present invention provides: transparent (: a fat-shaped seed light guide core ^ ^ at least the opposite of the surface 2 The number 2 is. The surface is a light-emitting surface. The 4 sides start to face toward the center to reduce the light-incident surface. The back is a light-reflecting surface composed of a light-incident surface ..., 4 ^ plate thickness. All of the side surfaces become the light guide plate of the L-loading system, which is the 4th direction of the transparent resin molded body to reduce the thickness of the plate. The surface becomes a light reflecting surface composed of 4 sides facing toward (3) the curved surface formed as in item 2; all of the sides become long ': light guide plates' are 4 (4) as light incident surfaces as described in The light guide plate described in the second item is a transparent resin that has a resin. 2219- 200424565 V. Description of the invention (3) Polymer resin with a ring structure (5) The light guide plate described in the first item is a transparent resin ring The polymer resin of the structure is opposite to 4 of the 4 side surfaces: it has a grease-emission surface, and the back surface is formed by the 2 light incident surfaces starting toward the center to reduce the extension | thickness and the minimum thickness in the center. (6) The light guide plate as described in item 1 has a pattern of fine irregularities on the light exit surface and / or reflection surface. In addition, it is an ideal form of the present invention. The system can be listed as follows: (For example, the light guide plate carried in item 4 or 5 is a polymerization resin having an alicyclic structure to form an original spinane monomer or a vinyl alicyclic hydrocarbon dimer. Additives of hydrogen; and (, 8) The light guide plate as described in item 7, is the original The polymerization of alkane monomers becomes tricyclic [4. 3 · 0 · 1U] eleven 3, 7 monodiene and 8 _ ethylene tetracyclo · 4.0 · 12'5 · 17'ιο] twelve ~ 3 _Copolymer between olefins. [Embodiment]

The light guide plate of the present invention has a plate shape with a front surface, a back surface, and four side surfaces. The surface of the moon-shaped shaped body becomes a light exit surface, and two of the four side surfaces ^ opposite two surfaces become light incidence surfaces. The back surface starts from the light incident surface: a light reflecting surface formed by reducing the thickness of the plate toward the center. The light guide plate of the original desire can make all four sides of the transparent resin molded body into a light incident surface, and the back surface becomes a light reflecting surface formed by the four side surfaces starting from the center and reducing the thickness of the plate.

200424565 V. Description of the invention (4), FIG. 1 is a schematic plan side view of a certain form of the light guide plate of the present invention, a cross-sectional view along line A_A and a cross-sectional view along line β-β. The light of this form is a plate-shaped transparent resin with a front surface, a back surface, and four sides. The plate surface becomes a light exit surface 1, and all four sides become a light incidence surface 2. = The surface becomes from the side toward the center. On the other hand, the light reflecting surface 3 formed by the concave curved meniscus formed by the plate thickness is reduced. The light guide plate of this form has a concave curved surface so that it can be called a dome-type light guide plate. The light guide plate in the form shown in Fig. 1 is rectangular as four side portions of the light incident surface. A light guide plate can be provided by making all of the four sides into a full hand shape. A light guide plate can be provided in all of the four sides, and light can be incident from four directions. / The light guide plate of the form shown in Fig. 1 has a curved surface. Therefore, the light incident on the guide plate collides with the curved surface and reflects in multiple directions. Therefore, the light utilization efficiency becomes higher and the light guide plate is improved. At the same time, brightness unevenness is reduced. In addition, since the light guide plate of the form shown in Fig. I is a & light, and the reflecting surface is a concave curved surface, the amount of resin used in the light guide plate can be reduced and the weight can be reduced. Figure! The light guide plate of the form shown is a curved surface and has no stress concentration. Therefore, the separable intensity becomes thinner and lighter. In the light guide plate in the form shown in FIG. 1, the so-called center is formed by the roughly rectangular shape of the surface of the plate-shaped formed body with a surface and a back surface and 4 sides. The sides of each side are divided by the midpoint 'are divided by four straight lines drawn parallel to each side. In the light guide plate of the form shown in Figure 1, the back is opened from the four sides, starting at °.

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Shaped in the center to reduce board thickness… Exists in the aforementioned area. For the curved surface, the minimum point system of the thickness of the light guide plate, the center system can be approximated; = 2 into a rough rectangular shape, and you can find it by the parent point of y diagonal lines. Attempts to find the shape of 2 stops diagonally separated from the shape of a tight rectangle and the center of gravity becomes the center of geometry. In addition, the center of gravity of the rough rectangle, which is a rough rectangular plate in its own shape, is not a light guide and is thick: at the middle incident surface, the light is reduced toward the center, and the light 2 is the inclined surface formed by the minimum thickness. Schematic top views of other forms of the light guide plate of the m invention, m-pictures, and b-b cross-sectional views. The light guide plate f of this form is a plate-shaped formed body of a polymer resin composed of a table f, a lunar surface, and a side surface and having an alicyclic structure. The surface becomes the light exit surface 1, and two of the four side surfaces oppose each other. The surface becomes the light-emitting surface 2 and the f-surface becomes the light-reflecting surface 3 formed by the two light-emitting surfaces starting from an inclined surface formed by reducing the thickness of the plate and the center of S to the minimum plate thickness. The size of the light source that can be installed on the side of the light guide plate is determined by the size of the side. Therefore, the light guide of this shape can be more lightweight than a flat light plate that can be provided with a light source of the same size. In addition, the light incident on the light emitting surface in parallel starting from the light source provided on the side surface contacts the inclined light reflecting surface.

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T 仃 reflections' can therefore be used more efficiently than flat-shaped light, resulting in high brightness and brightness uniformity. Let's pass 1. The schematic top view of other forms of the light guide plate of the native Ming Dynasty, == line cross-section view and BB line cross-section view. The light guide plate shake of this form = the polymer formed by the surface, the lunar surface, and the side surface and having an alicyclic structure, the plate-shaped formed body is a light emitting surface i, and one of the four sides is: 2 Each surface becomes a light incident surface 2 and the back surface is formed by two light incident surfaces opened 1 toward the center to reduce the thickness of the plate and the minimum plate thickness at the center is inclined: a curved surface and a light reflecting surface 3. T is set on the side of the light guide plate: the light source control of the part is determined by the size of the side. Therefore, the light guide plate of this shape can be performed more than a flat light plate that can be set with a light source of the same size. Lightweight. The light guide plate of this form has a curved light reflecting surface. Therefore, the angle of incidence of the light system incident parallel to the light guide plate on the light reflecting surface is different from each point on the light reflecting surface, and the light is emitted in multiple directions. Therefore, the light utilization efficiency becomes higher, the brightness of the light guide plate is improved, and at the same time, the brightness unevenness is reduced. In addition, the light guide plate of the present embodiment is a curved surface portion where there is no stress concentration. Therefore, it is possible to maintain a sufficient strength to reduce the thickness and weight. In the light guide plate in the form shown in FIG. 2 and FIG. 3, the so-called center starts from the center of a roughly rectangular shape that has a surface of a plate-shaped molded body having a front surface and a back surface and four side surfaces. The midpoint of the vertical line of each side corresponding to the two sides is an area surrounded by the two straight lines drawn parallel to each side. The back side of the light guide plate in the form shown in FIG. 2 or FIG. 3 is reduced from the two sides that become the light incident surface toward the center.

2219-6203-PF (N2); Ahddub.ptd Page 12 200424565 V. Description of the invention (7) Where: The minimum point of the plate thickness of the L: / guide plate exists in the foregoing and becomes roughly long ^ 90%: body surface The shape of the center of the approximate rectangle can be obtained by the parent point of the diagonal line. The rough rectangle is two diagonal lines. In the center of the shape of the rectangle, you try to find the center of gravity of the approximate long Λ _ slightly rectangular shape, which becomes the geometric shape ... the shape of the rectangle; the center of gravity is the center of gravity. It ’s not the pilot board itself. I ::: ί 导 = 如 ί = The thickness of the light reflecting surface should be reduced away from the side.> The thickness of the board, for example, from the side: the same thickness as the side. The plate thickness change system can be used to maintain the thickness of the plate when the liquid crystal display device is used. It can be used as a place to install the light guide plate, and the position of the light guide plate. The light guide plate is the light guide plate of the present invention. The light incidence is preferably 0.2 to 50 mm, and more preferably, the thickness of the side surface of the 0.5 surface is 30 nm. Outside the Λ, the thickness of the central portion is best: surface =? Is preferably 1 to 0.95 times, and more Ideally, the thickness of o.i'o.g is 0.05 times the thickness of 55. 彳. Especially preferred is 0.15 ~ 0. The light guide with unclear light is low, and the surface is fine, with a pattern of fine unevenness. You can sa ^ And / or light reflection to become a light guide plate with even brightness. The concave-convex figure has light reflection function The shape, then = = two text lines having a plurality of good reflect incident from the side surface: Shui ^ 'but piece goods' ί

This shape is preferably such that the light exit surface has a shape of _. J is composed of a plurality of parallel v-shaped grooves

200424565 V. Description of the invention (8) shape, continuous triangular 稜鏡 shape, continuous circular 稜鏡 shape i: η fine bump map. In addition, the light reflecting surface is preferably a fine uneven pattern having a columnar shape, an elliptical columnar shape, a quadrangular prism shape, a quadrangular frustum shape, or a linear shape. Fig. 4 is an example of a continuous triangular 稜鏡 shape: an intentional perspective view; Fig. 5 is an example of a continuous circular 稜鏡 shape: an unintended perspective view; and Fig. 6 is another example of a continuous triangular 稜鏡 shape. In the example shown in Fig. 6, the head angle 0, the height h, and the position of the bottom edge dagger are set with a pitch p and a width w. In the second light of the present invention, the head angle Θ of the mirror is preferably "~ ⑺ °, more preferably 45 ~ ^ 70, and the distance between the corners of the mirror P is preferably 10 ~ β " 1, and more preferably 2 〇 ~ 400 // m, particularly preferably 3〇 ~ 3〇 () # m. In addition, the radius of curvature of the arc-shaped 稜鏡 is preferably 5 ~ μ, more preferably 10 ~ 40 // m It is particularly preferable that the distance between the i 5 to 30 mirrors is preferably 5 to 50 0 // m, and more preferably 10 to 400. The text is particularly preferably 15 to 300 / zm. For the light guide plate, the cylindrical system provided on the light reflecting surface is preferably such that the ratio h / Wmax between the angle or depth h and the maximum opening width wmax is 0.3, or more preferably 0.4 or more, and particularly preferably u or more. The sugar column system is good. The long diameter is 50 to 6 0 0 // m, the short diameter is 5 to 300, and the ratio of the long diameter to the short diameter is 1 to 10. The square column system is preferably the long side 50 to 6. 〇 二 ®, short side 5 ~ 3 0 0 // Hi, the ratio of long side / short side becomes 1 ~ 10, the ratio h / w between the ancient depth h and the maximum opening width W- is preferably two times , More preferably 0.4 or more, particularly preferably 0.5 or more Truncated square pyramid

Look at 22l9'62〇3-PF (N2); Ahddub.ptd Page 14 200424565 V. Description of the invention (9) —— The best angle is 25 ° to 45 °, the bottom side is below 〇0 / zm, the height 2 ~ 1 5 // m. It is preferable that the linear fine uneven pattern is a triangle, a circle, a four corner, a mesa, or the like in cross section. 1. In the light guide plate of the present invention, the convex or concave system of the light reflecting surface is preferably spaced below 10, 0 0 0, more preferably 8, 00 0 // m, particularly preferably 5 0 0 0 or less. The proportion of the dot pattern occupied by the spaces is 0: 1 to 95%, and more preferably 30 to 95%. The height or degree of convexity or concavity is preferably 0. i ~ 5 0 0, and more preferably i ~ special or less. More preferably, it is 0.4 mm2 or less, and particularly preferably 0.3 mm2, and the convex pattern on the light reflecting surface is " ~ ... m series, preferably as a heart, to arrange the light inversion in an organic manner. Can be by optical interference i. The convexity of the light-reflecting surface = ^ prevents the liquid crystal panel from being located closer to the side of the light guide plate u: The distribution of the pattern is preferably away from the light source and becomes dense. Can be ", become sparse, compare, 1 sparse, relatively far away from the light source, the reason is closer to the light source = the brightness of the entire surface becomes almost equal, dense, so that the liquid crystal display device: the emitting surface becomes a pear skin pattern This can reduce uneven brightness. In addition, it is best if the maximum height & becomes G ·, and the surface rough bond degree of the pear skin pattern is β " 1, and more ideally, it is 〇 !! ~ "2219-6203-PF (N2); Ahddub.ptd 页 15 200424565 V. Description of the invention (10) 'Especially preferably 0.1 ~ 3 / zm. Production, hair: transparent resin used for two light guide plates' There is no particular limit = the total light transmittance of the forming plate of 3mm The system is preferably 70%. More preferably, it is 75% or more, and particularly preferably 80%. The tree secondary system can be exemplified by methyl propyl resin, polycarbonate with tfm & methyl methacrylic acid-styrene copolymer. Resin, polymer with m = 3 compound resin, polyethylene terephthalate, and rhenium polymer = :: Suitable; use alicyclic structure to stabilize the god, cup f V plate into light weight, The hygroscopicity is extremely low, and the ulnar core 乂 does not cause bending in the light guide plate, and the formability is good, because it does not produce inferiority, etc. The thin-walled guide plate is used to enter and eject into the shape. Also: The polymer resin system can be listed in the main chain structure: poly polymer resin. The alicyclic type in the main chain is suitable for the use of mechanical strength. The heat resistance is good. For this reason, the carbon number system is best, and the type I structure system is preferably a 1 ^ -like hydrocarbon structure, 6 ~ 15. Moreover, 2 ~ 30 ′ is more preferable, and 5 ~ 20 ′ is particularly preferable. It is preferable that the ratio of the alicyclic structure in the polymer resin having a cyclic structure is 50% or more, and more reasonably: ❾ Ϊ, 上, and 特别 'are particularly 90% by weight or more. The polymer resin structure of the formula can be exemplified by ortho-addition: ortho-cyclopentane, polymer or ring-opening copolymer, or hydrogen addition of these, or additional polymers or additional copolymers of proton, or

200424565 V. Description of the invention (11) Some hydrogen additives, polymers of monocyclic cyclic olefin monomers or compound co-rolled diene monomers or their hydrogen additives: 1, 1: 乂: ring tobacco Polymers or copolymers of monomers or these are polymers or copolymers of% aromatic aromatic smoke-based monomers of the formula: ::: rhenium additives such as stilbene unsaturated bonds. Here, t go to 12,5 · Γ 'of the 3 sides of the fragrant soil]] 0] Twelve one 3 — can be 1 for the light guide plate even in high temperature and humidity so' especially can be gathered: substances, hydrogen additives and Vinyl aromatic ;; Department of single =: The body contains the unsaturated bond part of the fragrant sorrow 哀 氲 added products: = good properties, so especially suitable. ： = Mechanical strength and heat resistance—3, 7-diene and 8-ethylenetetracycline [4.4 〇 衣 4.3.0. I2'5] The weight of the hydrogen additive system of the dilute smoke copolymer is small, and the weight is reduced, A light-guide plate that can be used with minimal hygroscopicity and is unlikely to deform is suitable for use. In the manufacturing method of the light guide plate of the present invention, the helmet is suitable for injection molding, especially; η compression molding. If it is compressed by injection, the mouth is used—two = pair; =; with holes ... Table ...: recessed; closed: volume, high mold The bending of the light guide plate of the present invention is corrected. χ Light guide plate has become redundant and evenness ^ ^ The reflection surface is formed toward the center to reduce the thickness of the plate: two lines are lighter to obtain a light guide plate with good dimensional stability. The Secret of the Secret Moon Comes to Melon, Example 17 2219-6203-PF (N2); Ahddub.ptd 200424565

V. Description of the invention (12) Hereinafter, examples will be given to further enhance the present invention. The present invention is not based on these examples. In addition, the examples and comparative examples were evaluated. Although this invention is demonstrated in detail, it is not limited at all. 'The light guide plate is (1) average brightness on the light incident surface of the light guide plate by the following method' A straight tube type cold cathode fluorescent lamp [Harrison Toshiba Lighting Co., Ltd., MBSM24JN10WX37〇NLU] is formed into a tubular shape Cold cathode glare lamp [Harrison Toshiba Lighting Co., Ltd., MLVM24M0WX37 0 / 275NLH], assembled LCD display device, constant temperature and thirst at temperature "C, relative humidity 6 5% or temperature 60 t, relative humidity 95% Two hours after the chamber came in, the brightness was measured. On the light exit surface side of the light guide plate: the surface formed on the inner side of 10_ by the sides forming the light exit surface, assuming that it was divided into 4 points at equal intervals. For each of the 5 lines in the vertical direction and the horizontal direction, at a total of 25 intersections of each line, the brightness was measured using a meter [Merida Co., Ltd., CA—500W], and the average value was calculated. (2) The brightness uniformity is such that the ratio of the maximum value and the minimum value of the aforementioned 25 brightness measurement values, that is, {(minimum value) / (maximum value)} X 100 (%), becomes the brightness uniformity degree. (3) Absorption The amount of wet deformation is constant temperature and humidity at a temperature of 60 ° C and a relative humidity of 90%. Place the light guide plate in the room for 2 hours, and then place it on a flat plate, and use a gap meter [Tokyo Sikunix Co., Ltd., 100ML] at each midpoint of 4 sides and 4 corners. A total of 8 places' measurement and the gap between the plate, so that its maximum value becomes hygroscopic

2219-6203-PF (N2); Ahddub.ptd Page 18 200424565 V. Description of the invention (13) Deformation. Production Example 1 (Production of polymer resin having alicyclic structure)

At room temperature, put 500 parts by weight of dehydrated cyclohexane, 0.82 parts by weight of 1-hexene, 0.15 parts by weight of dibutyl ether, and 0.3 parts by weight of triisobutylaluminum at room temperature. Fully dry nitrogen-substituted pressure-resistant stainless steel pressure vessel is mixed and maintained at 4 5 ° C. At the same time, the tricyclic ring is continuously added and polymerized after 2 hours [4. 3. 0 · P'5] 十 _3 , 7 monodiene (dicyclopentadiene μ 70% by weight, 8-ethylene tetracyclo [4.4.0.0.12'5.17, 10] twelve 3-olefin (ethylene tetral 11 30 parts by weight of carbene) and 40 parts by weight of 0.7% by weight of toluene solution in hexachloride. Next, to the polymerization solution, 0.6 parts by weight of butylepoxypropyl ether and isopropanol were added. 52 parts by weight was used to passivate the polymerization catalyst, and the polymerization reaction was stopped. 1,000 parts by weight of the obtained ring-opening polymer-containing reaction solution was added with 3 to 5 parts by weight of cyclohexane, and the catalyst was added as hydrogen. 5 parts by weight of nickel monoxide catalyst [manufactured by Chemical Co., Ltd.], pressurized to 5 MPa with chlorine, and stirred while warming to 2000. It is The reaction was continued for one hour to obtain a 20% by weight reaction solution containing a hydrogen addition of dicyclopentadiene-ethylene tetracyclic polymer. 10 ° parts by weight of the substance was added as a oxidative preventive agent pentaerythritol tetrabis [3- — (35 ”-1 ~ M-phenylphenyl) propionate]." Parts by weight: enter "solution" Di-butyl-4-cylinder type concentrating dryer [Hitachi Co., Ltd., using a circular pressure of IkPa or less, from the solution table (version) V3], at a temperature of 27 (TC, spear, to become> Ring of Mori media Hexane and other solvents

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tt'And 'in a molten state, extruded from the extruder in a stranded form ^ pentadiene-& ethyl tetracyclododecane dilute ring-opened polymer hydrogen addition 2, after cooling, the ball Granulate to recover resin pellets. Example 1 A short resin 276 was formed from a polymer resin having an alicyclic structure by injection compression molding method [Nippon Tetsuo Co., Ltd., Teo Noah 1060 under the trade name η. " Melon, long side 344.〇111111, thickness of the side part 8011111, thickness of the central part 2. 0_ dome type 17 inch light guide plate. Cut the light guide on a plane I parallel to the short side & The t-curve formed by the central material is an arc with a radius of curvature of 1,592 mm. The mold is fixed on the surface of the hole that becomes the light reflecting surface of the light guide plate, and a hemispherical protrusion with a diameter of 60 / zm will be formed on the surface of the molded body. Hemispherical holes are sequentially added and installed from an average pitch of 300 ° from the light incidence surface to an average pitch of 300 ° to an average pitch of 150 / zm in the center. Injection compression molding uses an injection molding machine [ Toshiba Machinery Co., Ltd., IS35 0GS, screw diameter 70_, mold clamping force 3,43kN], under the conditions of forming temperature of 275 ° C, mold temperature of 70 t, forming cycle of 90 seconds. The light guide plate has a weight of 393 g and a moisture absorption deformation of 0.5 mm. The 4 side portions of the guide plate are respectively equipped with 2 straight tubes / a total of 8 straight cold-cathode fluorescent lamps, and the liquid crystal display device is assembled. The brightness is measured after being placed at 20 ° C and 65% relative humidity. The average brightness is 7 200cd / m2, the brightness uniformity is 88%.

200424565 V. Description of the invention (15) Example 2 Two L-shaped tubes with a total of four L-shaped tubes on the long side and short side adjacent to the light guide plate obtained in Example 1 are installed. A cold-cathode fluorescent lamp was assembled with a liquid crystal display device, and after being left at 20 ° C and a relative humidity of 65%, the brightness was measured. The average brightness is 5, 800 cd / m2, and the brightness uniformity is 87%. & 'Example 3 is the same except that a copolymer between methacrylic acid and styrene [Nippon Steel Chemical Co., Ltd., Estilink MS — 6 0 0] is used as the transparent resin. In Example 1, a dome-type 17-inch light guide plate was formed by the injection compression molding method. The weight f of the light guide plate paid was 4 4 7 g 'and the moisture absorption deformation amount was 3 mm. On the four side portions of the light guide plate, two straight cold tube fluorescent lamps of a total of eight were installed, a liquid crystal display device was assembled, and the brightness was measured after being placed at 200 t and a relative humidity of 65%. The average brightness is 6,600 c ^ / m2, and the brightness uniformity is 86%. Example 4 A dome was formed in the same manner as in Example 1 except that a fluorene-based acrylic resin [Asahi Kasei Co., Ltd., Delbito 7 0 Ν Η X] was used as the transparent resin, and the dome was formed by injection compression molding. Type 1 7 inch pair light guide plate. The weight of the obtained light guide plate was 472 g, and the amount of moisture absorption deformation was 5 mm. On the four side portions of the light guide plate, two straight tube-shaped cold-cathode fluorescent lamps with a total of eight were installed, a liquid crystal display device was assembled, and the brightness was measured after being placed at 2000C and a relative humidity of 65%. The average brightness is 6,800 (: (1/1112, both brightness

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The overall degree is 87%. Example 5 Molded by injection compression molding. Beginning with the polymer resin having an alicyclic structure obtained in Manufacturing Example 1, it has a short side of 276.4 mm, a side of 344.0 mm, and a thickness of the long side. A 17-inch type light guide plate having a shape as shown in FIG. 2 with a thickness of 8.0 mm in the central portion and 2.0 mm and a light reflecting surface that is inclined from the short side portion to the central portion. The mold is on the surface of the movable hole that becomes the light reflecting surface of the light guide plate, and a hemispherical hole with a hemispherical protrusion with a diameter of 6 0 // m will be formed, and the average distance between the positions of ^^ 1 0 mm from the side is 3 0 0 / / m — Until the average distance in the center is 1 5 0 // m, the intervals are sequentially added and set. The injection compression molding system uses an injection molding machine [Toshiba Machinery Co., Ltd., IS350GS, screw diameter 70mm, mold clamping force 3, 430kN], and the molding temperature is 2 7 5 ° C, the mold temperature is 7 0 C, and the molding cycle period is 9 Under the condition of 0 seconds. The weight of the obtained light guide plate was 4 8 1 g, and the amount of moisture absorption deformation was 0 · 5 mm. On the two side portions of the long side of the light guide plate, two straight cold cathode fluorescent lamps of a total of four were installed, a liquid crystal display device was assembled, and the brightness was measured. The average brightness of a light guide plate placed at 20 ° C and 65% relative humidity is 3,200cd / m2, and the average brightness is 86%. The average brightness of a light guide plate placed at 60 ° C and a relative humidity of 90% is 3,160 cd / m2, and the brightness uniformity is 86%. Example 6

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V. Description of the invention (17) Except for the use of a movable hole surface which becomes a flat surface and becomes a flat surface and is not shaped on a light reflecting surface, the rest is the same as in Example 1. Except for a mold formed into a hemispherical projection, an injection compression molding method is used. And forming 7-inch light guide plate. The weight of the light guide plate paid was 481 g, and the amount of moisture absorption deformation was 0.5 mm. On the two side portions of the long side of the light guide plate, two straight cold cathode fluorescent lamps with a total length of 4 are installed, a liquid crystal display device is assembled, and the brightness is measured. The average brightness of a light guide plate placed at 20 ° C and 65% relative humidity is 2,500 cd / m2, and the brightness uniformity is 75%. The average brightness of a light guide plate placed at 60t and a relative humidity of 90% was 2,48 cd / m2, and the brightness uniformity was 75%. Comparative Example 1 An alicyclic structure was formed by injection compression molding. Polymer resin [said Zhewon Co., Ltd., Jeonuoa 1 〇〇〇〇〇〇 (product name)], to form a short side 276.4mm, long side 344.0 Omm, thickness 8.0mm flat plate 1 7 Inch type light guide plate. The mold is fixed on the surface of the fixed hole that becomes the light reflecting surface of the light guide plate, and a hemispherical hole with a semi-spherical protrusion with a diameter of 60 # m will be formed. The average distance from the light incidence surface to 10 mm is 3 0 / zm -Until the average distance in the center is 150 / z in, the intervals are added and set in order. The injection compression molding system uses an injection molding machine [Toshiba Machinery Co., Ltd., IS350GS, screw diameter 70mm, mold clamping force 3, 430kN], and is performed at a molding temperature of 275 ° C, a mold temperature of 70 ° c, and a molding cycle of 90 seconds. Conditions. The weight of the obtained light guide plate is 768S, and the amount of moisture absorption deformation is

2219-6203-PF (N2); Ahddub.ptd page 23 200424565 V. Description of the invention (18) 0 · 5mm. On the four side portions of the light guide plate, two straight cold-cathode fluorescent lamps with a total of eight were installed, a liquid crystal display device was assembled, and the brightness was measured after placing it at 20% and relative humidity of 65%. The average brightness is 6,000,000 (^ / 1112, and the brightness uniformity is 85%. Comparative Example 2 The two sets of side portions of the adjacent long side and short side of the light guide plate obtained in Comparative Example 1, Install 2 L-shaped cold-cathode fluorescent lamps with a total of 4 pieces to assemble a liquid crystal display device, and place them at 20 ° C and relative humidity

After 6 5%, the brightness was measured. The average brightness is 4, 80Ocd / m2, and the brightness uniformity is 84%. Comparative Example 3 A flat resin having a short side of 276 · 4 mm, a long side of 344.0 mm, and a thickness of 8.0 mm was formed from the polymer resin having an alicyclic structure obtained in Production Example 1 by injection compression molding. 17-inch light guide. The mold is located on the surface of the movable hole that becomes the light reflecting surface of the light guide plate, and a hemispherical hole with a semi-spherical protrusion with a diameter of 60 / zm will be formed. The average distance from the light incident surface to the position of 10 mm is 30 to the center. The average distance is up to 15 0 // m, and the intervals are sequentially added and set. Second, injection compression molding system uses an injection molding machine [TOSHIBA MACHINERY Co., Ltd. IS350GS, screw diameter 70mm, mold clamping force 3,43〇kN], injection molding temperature 2 7 5 ° C, mold presentation, Tiansheng 7 Π. Factory, ri ·, λ / μ; The moisture absorption deformation amount of the wedge with a degree of 70 C during a forming cycle of 90 seconds is based on a weight of 7 6 8 g and 5 mm. On the two side portions of the long side of the light guide plate,

200424565 V. Description of the invention (19) Straight tubular cold-cathode fluorescent lamps with 4 strips, assembled with a liquid crystal display device, and measured the brightness. The average brightness of a light guide plate placed at 20 ° C and 65% relative humidity is 2,700cd / m2, and the brightness uniformity is 81%. The average brightness of a light guide plate placed at 6 (pc, 90% relative humidity is 2,67 cd / m2, and the brightness uniformity is 81%. Comparative Example 4 In addition to using a fluorene-based acrylic resin [Asahi Kasei Corporation), Except for the transparent resin, the rest is the same as in Example 1 except that it is formed into a flat plate by injection compression molding method; [7 inch light guide plate. The weight of the obtained light guide plate is 91 3g The moisture absorption deformation is 3mm. On the four side portions of the light guide plate, two straight tubular cold-cathode fluorescent lamps with a total of 8 pieces are respectively installed to assemble a liquid crystal display device. After 65% of the degree, measure the party's degree. The average brightness is 5,700c ^ / m2, and the brightness uniformity is 84%. Comparative Example 5 Two sides of the long side of the light guide plate obtained in Comparative Example 4 2 pieces of straight tubular cold-cathode fluorescent lamps were installed in total and 4 pieces were assembled, the liquid crystal display device was assembled, and the brightness was measured. The average brightness of the light guide plate placed at 20 ° C and 65% relative humidity was 2, 60Ocd / m2 , The brightness uniformity is 80%. The average brightness on a light guide plate placed at 60 ° C and 90% relative humidity It is 2,340cd / m2, and the brightness uniformity is 74%. The shape of the light guide plate of Examples 1 to 6 and Comparative Examples 1 to 5, the type of transparent resin, the presence or absence of a convex pattern, the weight, and the amount of moisture absorption deformation are displayed. In Table 1, the installation status, brightness and brightness uniformity of the cold cathode fluorescent lamp are displayed.

2219-6203-PF (N2); Ahddub.ptd Page 25 200424565 V. Description of the invention (20) is shown in Table 2. Table 1 Shape transparent resin convex case weight (g) Moisture absorption deformation (mm) 賨 Example 1 Dome alicyclic structure has 393 0.5 賨 Example 2 賨 Example 3 Dome MS1) 447 3 Treasure examples 4 Dome methacrylic has 472 5 Bosch Example S Beveled alicyclic structure has 481 0.5 賨 Example 6 Beveled alicyclic structure M 481 0.5 Comparative Example 1 Flat alicyclic structure has 768 0.5 Comparative Example 2 Comparative Example 3 Comparative Example 4 Flat methacrylic acid has 913 3 Comparative Example 5 [Note Chuan MS: Methacrylic acid-phenylacetic acid copolymer Table 2 Light incidence surface number lamp 20 ° C, 65% RH 60 ° C ^ 90% RH Number of shape bars Brightness (cd / m2) Brightness uniformity (%) Brightness (cd / m2) Brightness uniformity (%) Example 1 4 Straight tube 8 7200 δδ — Example 2 4 L-shaped tube 4 5800 S7 — Yibao Example 3 4 Straight Pipe S 6600 S6 One—Bao Shi 4 4 Straight Pipe 8 6800 S7—Yi Bao Shi 5 2 Straight Pipe 4 3200 86 3160 S6 Bao Shiyi 2 Straight Pipe 4 2500 75 2480 75 Compare Example Fly 4 Straight Tube 8 6000 & 5 I—Comparative Example 2 4 L-shaped tube 4 4800 S4 One Comparative Example 3 2 Straight Tube 4 2700 81 2670 81 Comparative Example 4 4 Straight Tube 8 5700 S4 — — Comparative Example 5 2 Straight tube 4 2600 80 2340 74 See from Table 1: The light guide plates and light reflecting surfaces of Examples 1 to 4 that make the light reflecting surface a concave curved surface become gradually away from each other. The light guide plate of Examples 5 to 6 as the inclined surface formed by reducing the thickness of the light incident surface as a side surface

2219-6203-PF (N2); Ahddub.ptd Page 26 200424565

It is lighter than the flat plate of Comparative Example 1 and is lighter in weight. The light guide plate of 5 makes the weight more important. The implementation of the fat-forming material as a resin having an alicyclic structure. The light guide plates of Examples 4 to 5 and Comparative Examples 1 to 3 are made of a material that is more transparent than the transparent tree A. A & methacrylic acid- $ ethylene polymer Example 3 = Implementation of the pilot plate and transparent resin molding material as methacrylic resin 歹 1, light guide plates of Comparative Examples 4 to 5, the amount of deformation caused by moisture absorption is further reduced , Good dimensional stability. The light guide plates of Embodiments 4 to 4 which make the light reflecting surface a concave curved surface can make all four sides become light incident surfaces. By installing many lamps, the brightness becomes high and the brightness uniformity is good. On the other hand, the light guide plates of Comparative Examples 1 to 2 and 4 of the flat plate shape have lower brightness than the light guide plates of Examples 1 to 2 and 4 in which the same number of lamps are installed. The degree also becomes low. The light guide plates of Examples 5 to 6 and Comparative Example 3, in which the transparent resin molding material became a resin having an alicyclic structure, were placed in an environment of 60 t and a relative humidity of 90%, so that the brightness and brightness uniformity were reduced. The reduction becomes extremely small. On the contrary, the light guide plate of Example 5 in which the transparent resin molding material became a methacrylic resin was placed at an environment of 60 ° C and a relative humidity of 90%. The degree of reduction becomes larger. u Even if the light guide plate of the same shape has a convex pattern on the light reflecting surface, the light guide plate of Example 5 has better brightness and uniformity of brightness than the light plate of Example 6 without a convex pattern. . 200424565 V. Description of the invention (22) [Industrial applicability] The light guide plate of the present invention can make the light reflecting surface become a dome-shaped concave curved surface or reduce its thickness as it moves away from the side that is the light incident surface. The inclined surface can be reduced in weight, and a light guide plate with good dimensional stability can be obtained by using a polymer resin having an alicyclic structure and a high brightness and brightness uniformity.

2219-6203-PF (N2); Ahddub.ptd Page 28 200424565 Brief description of the drawings Figure 1 is a schematic top view and a sectional view of a certain form of the light guide plate of the present invention; Figure 2 is a light guide plate of the present invention Fig. 3 is a schematic plan side view and a sectional view of another form of the light guide plate of the present invention; Fig. 4 is a schematic perspective view of an example of a continuous triangle shape 5 is a schematic perspective view of an example of a continuous arc shape; and FIG. 6 is a schematic sectional view of another example of a continuous triangle shape. [Symbol]

0 ~ apex angle; b ~ bottom; h ~ height; p ~ pitch; w ~ width; 1 ~ light exit surface; 2 ~ light incidence surface; 3 ~ light reflection surface. 2219-6203-PF (N2); Ahddub.ptd Page 29

Claims (1)

424565 6. Application scope ϋ μ ^ Two kinds of light guide plates are plate-shaped transparent resin formed bodies with a surface and a back surface and 4 sides, which are characterized by: inward body + side surface is a light exit surface 'out of 4 sides At least two of the opposite surfaces are light-reflecting surfaces that are formed by opening the light-incident surface and reducing the thickness of the surface. Cheng Cheng) The light guide plate of the first item of L ° Monthly Patent Consumption, where “transparent resin” is all the light incident surface, and the back surface is oriented from 4 sides: the light reflecting surface formed by reducing the curved surface formed by the plate thickness . The light guide plate of patent No. 2 of the patent scope is included. Among them, all four sides that become the light incident surface are rectangular, of which the "transparent resin of which" is the transparent resin, as described in the scope of patent application. Item: The light guide plate has grease. Polymer resin with ring structure. 5. For towels, please apply the light guide plate of item i of the patent Ϊ! The polymer resin with grease mounting structure, 2 of the 4 sides opposite to each other are light incidence surfaces, and the back is QM '. The light incident surface starts to decrease toward the center to reduce the thickness of the plate and becomes a non-reflective surface formed at the center by the inclined surface formed by the minimum plate thickness of the horse. 6. If applying for patent 笳 |, = 0, the light guide plate of item 1 of Fan Gudi, wherein the light-emitting surface and / or light-reflecting surface 'has a pattern of fine unevenness. 2219-6203-PF (N2); Ahddub.ptd Page 30