KR101812385B1

KR101812385B1 - Light transmissive plate with protrusions

Info

Publication number: KR101812385B1
Application number: KR1020150127277A
Authority: KR
Inventors: 청-하오 왕; 신-헝 첸; 웨이-치 션
Original assignee: 치 메이 코퍼레이션
Priority date: 2015-04-02
Filing date: 2015-09-08
Publication date: 2017-12-27
Also published as: TWI544253B; CN106199787B; JP6195881B2; JP2016197224A; TW201636691A; KR20160118909A; CN106199787A

Abstract

The light-transmissive plate includes a main body having a first surface, and a protrusion formed on the first surface of the main body and protruding from the first surface. The projection has a platform-top surface with an irregular shape and an inclined surface connecting the first surface and the platform-top surface. The height Hp measured from the upper surface to the first surface of the body is in the range of 5 占 퐉 to 40 占 퐉 and the ratio of the area of the projections to the periphery of the projections is in the range of 100 占 퐉 to 147 占 퐉.

Description

[0001] LIGHT TRANSMISSIVE PLATE WITH PROTRUSIONS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a light-transmitting plate, and more particularly, to a light-transmitting plate having protrusions, which can be applied as a diffusing plate.

The diffuser plate is an optical plate that is applied to an electronic product such as a display that diffuses light introduced from a light source to achieve a uniform brightness on a screen. Diffusers having different light transmittances are manufactured by diffuser manufacturers to meet the different requirements of the images presented on the electronics. For example, a backlight module for an edge-illumination of a display (e.g., an LCD) generally includes a light guide plate made of a light-transmitting material, a linear light source (cathode fluorescent light (CCFL) Etc.), a reflective film positioned below the light guide plate and the linear light source, and several light diffusers (film or plate) and / or a lens film disposed on the light guide plate to form the light emitting surface.

In recent years, in order to reduce the power consumption of the color liquid crystal display (color LCD) and increase the brightness, one or two prism sheets are disposed on the diffuser plate or between the diffuser plate and the light guide plate to condense light from the light guide plate, The brightness of the front surface of the panel is increased. In order to improve luminance uniformity affected by different distances from the light source, a known technique of printing a dot pattern including a plurality of dots sequentially increasing an area having a distance from a light source on a light guide plate is disclosed . However, the diffuser plate above the light guide plate must diffuse the light uniformly and not show the dot pattern on the light guide plate. In addition, the prism sheet can be produced by forming a decorative laminate on a thermoplastic resin plate or by processing a radiation-curable resin by a prism mold. However, the manufacturing cost of these prism sheets is too high, which is considered to be the main reason that the backlight module is expensive. Additionally, the material selection range for manufacturing the known prism sheet is limited to its manufacturing method. In addition, a prism sheet without the function of light diffusion must be incorporated with the optical diffuser (film or plate), thereby causing complicated assembly issues.

In order to improve the luminance and luminance uniformity of the display, in addition to optical films such as a diffusion film, a prism sheet, and a luminance-enhancement film used in the diffusion plate as described above, a condensing effect of the luminance increasing film (BEF) An optical plate incorporating several functions such as incorporating a light diffusion effect has been researched and developed in order to achieve a lightweight and thin appearance and a low manufacturing cost of the display. Further, it is more preferable to develop a light diffusion plate capable of reducing the number of optical films as well as improving the luminance and diffusion characteristics because consumers are continuously changing to a display with a larger screen size (such as an LCD TV) Do.

The present invention relates to a light-transmissive plate with designed protrusions that can be applied as a diffuser plate to maintain high brightness and increase the uniformity of brightness.

According to the present invention, there is provided an electronic device comprising: a body having a first side; And a projection formed on the first surface and projecting from the first surface of the body. The protrusion has an irregularly shaped platform-top surface and an inclined surface connecting the first surface and the platform-top surface, wherein the height Hp measured from the top surface to the first surface (Hp) And the ratio of the area of the projecting portion to the periphery of the projecting portion is in the range of 100 m to 147 m.

According to the present invention, there is provided a backlight module including a light transmissive plate of one embodiment, wherein the backlight module has high luminance and high luminance uniformity.

According to the present invention, there is provided a display device including a backlight module having a light-transmissive plate of one embodiment, the display device having high luminance and high luminance uniformity.

The invention will be apparent from the following detailed description of a preferred but non-limiting embodiment. The following description is made with reference to the accompanying drawings.

1 is a plan view illustrating a part of a light-transmitting plate according to an embodiment of the present invention;
2 is a view showing protrusions of a light-transmitting plate according to an embodiment of the present invention;
3A is a diagram illustrating an image captured by an optical microscope of a measurement unit of a light-transmissive plate of Comparative Example 1;
3B is a diagram illustrating an image captured by an optical microscope of the measurement unit of the light-transmitting plate of Comparative Example 2;
3C is a diagram illustrating an image captured by an optical microscope of the measurement unit of the light transmissive plate of Example 2;
FIG. 3D is a diagram illustrating an image captured by an optical microscope of the measurement unit of the light-transmissive plate of Example 3;
FIG. 3E is a diagram illustrating an image captured by an optical microscope of the measurement unit of the light-transmissive plate of Example 4; FIG.
FIG. 3F is a diagram illustrating an image captured by an optical microscope of the measurement unit of the light-transmissive plate of Example 5; FIG.
FIG. 3G is a diagram illustrating an image captured by an optical microscope of the measurement unit of the light transmissive plate of Example 6; FIG.
4 is a diagram illustrating a backlight module according to an embodiment of the present invention;

Embodiments of the present invention disclosed below provide a light-transmissive plate that can be applied to a backlight module of a display device as a diffusion plate. According to the present embodiment, by forming the protrusion on the surface of the main body of the light-transmitting plate, the high luminance of the light emitting area of the display device can be maintained, and the luminance uniformity can be increased. Thus, this embodiment provides a light-transmissive plate having high luminance and improved diffusion characteristics. With respect to the display device to which the light-transmissive plate of the present embodiment is applied, the optical film generally employed in a typical display device can be reduced, thereby reducing the manufacturing cost and improving the display device (especially for a large display device) The weight can be made lighter and thinner. When the light-transmitting plate of the present invention is applied to a display device, the surface of the main body on which the protrusions are formed faces the light source (s) of the backlight module.

Embodiments are provided below with reference to the accompanying drawings in order to describe related structures and forms. However, the present invention is not limited to these. The same and / or similar elements of the embodiments are denoted by the same and / or similar reference numerals. It should be noted that not all embodiments of the invention are shown. Variations and changes may be made without departing from the spirit of the present invention in order to meet the requirements of actual application. There are other embodiments of the present invention that are not specifically illustrated but applicable. It is also important to note that drawings may not necessarily be drawn to scale. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

1 is a plan view illustrating a part of a light-transmitting plate according to an embodiment of the present invention. 2 shows protrusions of a light-transmitting plate according to an embodiment of the present invention. 1 and 2. The light-transmissive plate 1 of the present embodiment includes a main body 10 and protrusions 20 formed on the first surface 101 of the main body and protruding from the first surface 101. In one embodiment, the body 10 and the projections 20 are integrated as a single part. A single protrusion 20 is illustrated for illustrative purposes. The protrusions 20 configured as islands have a platform-top surface 201 having an irregular shape and an inclined surface (e.g., two inclined surfaces 203 and 204) connecting the platform-top surface 201 with the first surface 101, Respectively.

The platform-top surface 201 having an irregular shape means that the vertical protrusion of the protrusion 20 on the first surface 101 along the thickness direction of the main body 10 has an irregular shape as shown in Fig. 2 . In one embodiment, the distance measured from the platform-top surface 201 to the first surface 101 with an irregular shape is defined as the height Hp, which is in the range of 5 to 40 占 퐉 . In another embodiment, the height Hp is in the range of 10 mu m to 35 mu m.

The thickness of the light transmissive plate 1 is equal to the thickness Hm of the main body 10 + the thickness Hp of the protruding portion 20. When the light-transmissive plate 1 of the present embodiment is applied to the backlight module BLM as a diffuser plate, the thickness of the light-transmissive plate 1 ranges from 0.5 mm to 6 mm. If the thickness of the light-transmitting plate 1 exceeds 6 mm, the display device equipped with the BLM equipped with such a light-transmitting plate is too heavy to meet the requirements of current displays seeking light weight and thinness. If the thickness of the light-transmissive plate is less than 0.5 mm, the light-transmissive plate may suffer from insufficient rigidity and adverse effects on the result of the diffusion. In one embodiment, the thickness of the light-transmitting plate 1 is in the range of 0.6 mm to 5 mm (i.e., 600 탆 to 5000 탆). In another embodiment, the thickness of the light-transmitting plate 1 is in the range of 0.8 mm to 3 mm. In another embodiment, the thickness of the light-transmitting plate 1 is in the range of 0.8 mm to 2.5 mm.

The thickness Hp of the protruding portion 20 is equal to the thickness Hp of the protruding portion 20 because the thickness of the light transmissive plate 1 is mathematically equivalent to the thickness Hm of the main body 10 plus the thickness Hp of the protruding portion 20. [ It can be regarded as equivalent to the thickness Hm of the main body 10 since it is much smaller than the thickness Hm.

2, the inclined surface 203 of the projection 20 (as well as the inclined surface 204) has a vertical protrusion on the first surface 101 and the vertical protrusion of the inclined surfaces 203 and 204 And a width Ws in the range of 10 탆 to 160 탆, for example, in the range of 12 탆 to 150 탆. In one embodiment, the vertical protrusions of the slopes 203, 204 of the protrusions 20 on the first surface 101 have a width Ws in the range of 13 占 퐉 to 40 占 퐉. In one embodiment, the vertical protrusions of the slopes 203, 204 of the protrusion 20 on the first surface 101 have a width Ws in the range of 90 占 퐉 to 150 占 퐉. In one embodiment, the angle between the slopes 203, 204 and the first surface 101 ranges from 120 degrees to 177 degrees; For example, in the range of 125 DEG to 175 DEG.

The difference between the light-transmitting plate of this embodiment and the ordinary diffusion plate is that the light-transmitting plate of the embodiment has protrusions 20 larger than the microstructure formed on the conventional diffusion plate. In one embodiment, the maximum width Wm of the platform-top surface 201 having an irregular shape of the protrusion 20 is in the range of 0.15 mm to 8 mm (i.e., 150 μm to 8000 μm). In another embodiment, the maximum width Wm of the platform-top surface 201 having an irregular shape of the protrusion 20 is in the range of 0.175 mm to 7 mm. In another embodiment, the maximum width Wm of the platform-top surface 201 having an irregular shape of the protrusion 20 is in the range of 0.2 mm to 6 mm.

In addition, in one embodiment, the first side 101 (i.e., a portion of the first side that is exterior to the projection 20) has a thickness of less than 0.1 microns; For example, a surface roughness (Ra) of less than 0.085 占 퐉, for example, in the range of 0.01 占 퐉 to 0.08 占 퐉. In one embodiment, the platform-top surface 201 having an irregular shape is less than 0.5 占 퐉; Has a surface roughness (Ra) in the range of, for example, less than 0.3 mu m, preferably less than 0.1 mu m, for example, in the range of 0.01 mu m to 0.1 mu m. In one embodiment, a portion of the first surface 101 of the body 10 outside the protrusion 20 has a surface roughness Ra in the range of 0.02 mu m to 0.07 mu m, The upper surface 201 has a surface roughness Ra in the range of 0.03 mu m to 0.25 mu m. The main body 10 also has a second surface 102 opposite to the first surface 101. In one embodiment, the second side 102 of the body 10 has a surface roughness (Ra) in the range of 3 [mu] m to 30 [mu] m. In another embodiment, the second side 102 of the body 10 has a surface roughness (Ra) in the range of 4 탆 to 25 탆. Surface roughness (Ra) can be obtained by measuring the contour or surface using a three-dimensional (3D) profilometer. One of the embodiments is further described in detail with reference to the accompanying Figures 1 and 2. However, the present invention is not limited to this.

1, the light-transmissive plate 1 comprises several protrusions 20 formed on and protruding from the first surface 101 of the body 10. The light- The minimum distance d between two adjacent protrusions 20 ranges from 0.01 mm to 1 mm (10 m to 1000 m); For example, in a range of 0.015 mm to 0.95 mm (15 m to 950 m).

As shown in Figure 2, in addition to the irregularly shaped platform-top surface 201 (away from the first surface 101 of the body 10), the single protrusion 20 of one embodiment has an irregular shape Further comprising a first sloped surface 203 and a second sloped surface 204 defined and opposed to correspond to the two ends of the maximum width Wm of the platform-top surface 201 with the first sloped surface 203 and the second sloped surface 204 facing each other. Each of the first inclined surface 203 and the second inclined surface 204 connects the first surface 101 and the platform-upper surface 201 having an irregular shape. The first angle 180-alpha 1 is formed between the first inclined plane 203 and the first plane 101 and the second angle 180-alpha 2 is formed between the second inclined plane 204 and the first plane 101 . In one embodiment, the first angle 180 -? 1 ° is different from the second angle 180 -? 2 °; That is, α1 ≠ α2. In one embodiment, the first angle 180 -? 1 is substantially equal to the second angle 180 -? 2; That is,? 1 =? 2.

The platform-top surface 201 having an irregular shape of the protrusion 20 has a minimum length Dm perpendicular to the maximum width Wm and a minimum length Dm thereof of 0.03 mm to 1.5 mm .

However, the present invention is not particularly limited to these parameters. The values disclosed herein could be modified. The different positions of the slopes of the single protrusion 20 may have the same or different angles with respect to the first surface 101. [ In addition, the angles between the slopes of the different protrusions 20 and the first surface 101 could be the same or different. These conditions can be changed or changed according to the requirements of actual use. In one embodiment, the first angle 180 -? 1 and the second angle 180 -? 2 are in the range of 120 to 177, for example 125 to 175. In other embodiments, the angle between the different positions of the first surface 101 and the sloped surface of the single protrusion 20 could range from 120 to 177 degrees, e.g., from 125 to 175 degrees. In addition, the platform-top surface 201 of the protrusion 20 is substantially parallel to the first surface 101 of the body 10.

According to the present embodiment, the light-transmissive plate is made of a transmissive material such as a transparent resin or the like. Examples of applicable permeable resins include, but are not limited to, polycarbonate (PC), polystyrene (PS), polymethyl methacrylate (PMMA), methyl methacrylate-styrene copolymer (MS copolymer), acrylonitrile- Such as polyethylene terephthalate (PET), polyester (PES), polyethylene (PE), poly (ethylene terephthalate), polyolefin copolymers Propylene (PP), polyvinyl chloride (PVC), ionomers, and the like. In one embodiment, polycarbonate (PC), polystyrene (PS), polymethylmethacrylate (PMMA) and methyl methacrylate-styrene copolymer (MS copolymer) are materials for making light- Can be selected.

In this embodiment, the light-transmissive plate 1 further includes a plurality of diffusion particles diffused into the protrusions 20 and the body 10 to be added as an optical diffusing agent (ODA). For example, the light-transmitting particles can be added into the protrusions 20 and the body 10 as diffusion particles.

In the present embodiment, examples of the light-transmitting particles include inorganic particles such as glass particles and organic particles such as polystyrene resin, methacrylate resin and silicon resin. Preferably, the organic particles are selected as light-transmitting particles. Further, crosslinked organic particles are more preferable. It is preferred that the organic particles are at least partially crosslinked during manufacture, thereby maintaining the particle shape in the light-transmitting resin treatment. Therefore, it is preferable to select organic particles which are not still melted in the light-transmitting resin at the molding temperature of the light-transmitting resin, more preferably a crosslinked methacrylate resin and a crosslinked silicone resin. In one embodiment, a suitable example of a light-transmitting particle includes a structure having an inner core of poly (acrylic acid butyl ester) and an outer shell of poly (methyl methacrylate), and a partially crosslinked crosslinked methacrylate resin as a base material &Lt; / RTI > In another embodiment, the polymer particles are formed as a core / outer shell structure, wherein the core and outer shell comprise rubbery polyethylene (a product of Rohm and Hass Company, trade name: Paraloid EXL-5136). In one embodiment, the polymer particles comprise a silicone resin, such as a crosslinked siloxane (silicon-oxygen) (product of TOSHIBA Silicone Limited Corporation, trade name: Tospearl 120).

In one embodiment, the average particle size of the diffusing particles added to the light-transmitting plate 1 is in the range of 0.1 mu m to 30 mu m. In another embodiment, the average particle size of the diffusion particles added to the light-transmitting plate 1 is in the range of 0.5 탆 to 20 탆. In another embodiment, the average particle size of the diffusion particles added to the light-transmitting plate 1 is in the range of 1 탆 to 5 탆. For one embodiment, it may be desirable that the diffusing particles do not protrude from the surface of the body 10 and / or from the surface of the protrusions 20. In addition, the light-transmissive plate 1 of one embodiment has a light transmittance in the range of 50% to 70%, for example, 55% to 65%.

In addition, the average particle size of the light-transmitting particles (added as diffusing particles) can be obtained by measuring the weight-average particle size using the particle counting method, and the particle size can be obtained from the particle number / particle distribution analyzer model Zm (Nikkaki Bios Co., Ltd.). If the weight-average particle size of the diffusion particles is less than 0.1 mu m, the problem of insufficient diffusion may arise and the light emission from the light-emitting surface of the light-transmitting plate may be inferior. If the weight-average particle size of the diffusing particles is less than 30 mu m, the problem of insufficient diffusion is also raised, and the light emission from the light-emitting surface of the light-transmitting plate is also inferior, thereby decreasing the light transmittance.

Further, the amount of the light-transmitting particles (added to the light-transmitting plate 1 as the diffusion particles) may be in the range of 0.1 wt% to 20 wt% by weight of the transparent resin. In one embodiment, the light-transmitting particles are optionally added in the range of 0.5 wt% to 12 wt% by weight of the transparent resin. If the amount of the light-transmitting particles is less than 0.1 wt% by weight of the transparent resin, a problem of insufficient diffusion may be caused, and the light source arranged under the light-transmitting plate may be visible. On the other hand, if the amount of the light-transmitting particles is less than 20% by weight of the transparent resin, the light transmittance and the luminance will be reduced.

In one embodiment, the light-transmissive plate 1 is a transmissive polystyrene (PS) resin (GPPS PG-383D, such as CHI, Taiwan, etc., with the addition of light-transmitting particles MEI Corporation). Any suitable method and apparatus capable of producing a monolayer (i.e., light-transmissive plate 1) may be employed. In the present embodiment, the single-layered plate can be produced by melt extrusion to form a plate-like structure having a predetermined thickness. During melt extrusion, the polymer mixture typically begins to soften in the melt zone of the extruder, and the melt is pressed under a predetermined pressure. It has been proposed that the pressure in the melting zone should be reduced to between 1.33 kPa and 66.5 kPa before pressing the melt. If the pressure in the melting zone is not reduced before pressing the melt, oxygen can have an effect on the light-transmitting particles, in particular acrylic polymers, and cause damage to the surface of the particles, which can degrade the light diffusion properties. In addition to melt extrusion, other known methods such as injection molding, injection compression molding, blow molding, compression molding, powder injection molding and the like are all applicable for forming the light-transmitting plate 1.

Further, the light-transmissive plate 1 is not limited to a single-layer plate but may be a multilayer plate. For example, the light-transmissive plate 1 may further include a coating on the light-transmitting resin layer. In one embodiment, the thickness of the coating is in the range of 0.01 mm to 0.5 mm, for example in the range of 0.02 mm to 0.4 mm or 0.03 mm to 0.3 mm. If the thickness of the coating exceeds 0.5 mm, a display equipped with a BLM with such a light transmissive plate is too thick to meet the requirements of current displays seeking light weight and thinness. The coating on the light-transmitting resin layer may have a high transparency and a lenticular effect. The coating may be selected from one or a combination of acrylic resin, polymethyl methacrylate (PMMA), methyl methacrylate-styrene copolymer (MS copolymer) and acrylonitrile-styrene copolymer (AS copolymer) . &Lt; / RTI > Preferably, the coating may be made of polymethyl methacrylate (PMMA) and methyl methacrylate-styrene copolymer (MS copolymer).

In addition, one or more ultraviolet absorbers may also be added to improve weather resistance and light resistance (also known as "weathering resistance " or " weather fastness ") and also to improve resistance to harmful ultraviolet light. May be selectively added into the composition of the light-transmitting plate (1). In addition, one or more fluorescent agents may be selectively added into the composition of the light-transmitting plate 1 to absorb ultraviolet light and emit light again to the ultraviolet region.

In an optically transparent plate (1) having a multilayer structure, the amount of the ultraviolet absorber optionally added ranges from 0.5% to 15% by weight of the coating of the acrylic resin, wherein an average The light-transmitting particles having a particle size may be selectively added in an amount of 0.1 to 20 wt%, based on the weight of the coating of the acrylic resin, and the fluorescent agent may be added in an amount of 0.001 to 0.1 wt% And the like. In one embodiment, the light-transmitting particles may be selectively added in an amount of 0.5 wt% to 12 wt%, based on the weight of the coating of the acrylic resin.

In one embodiment, an example of an ultraviolet light absorber is given as follows: benzophenone ultraviolet absorber such as 2,2'-dihydroxy-4-methoxybenzophenone, triazine ultraviolet absorber, 2- (4,6-diphenyl-1,3,5-triazine-2-substituent) -5-hydroxycyclohexylphenol, benzotriazole azo dye absorbents such as 2- (2H-benzotriazol- (2H-benzotriazole-2-substituent) -4-methylphenol, 2- (2H-benzotriazole- (2H-benzotriazole-2-substituted) -4,6-bis-tert-pentylphenol, 2- (5-chloro-2H-benzotriazol- Methyl-6-tert-butylphenol, 2- (5-chloro-2H-benzotriazole- Bis [6- (2H-benzotriazole-2-substituent) -4- (1,1,3,3-tetramethylbutyl) phenol].

In one embodiment, a preferred example of an ultraviolet light absorber is given as follows: 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy- Benzotriazole, 2- (2-hydroxy-3,5-diisopropylbenzene) phenylbenzotriazole, 2- (2-hydroxy-3-tert- butyl-5-methylphenyl) Azole, 2,2'-methylene-bis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazole- -3- (3,4,5,6-tetrahydrophthalic < / RTI > succinamidomethyl) -5-methylphenyl] benzotriazole. Preferably, 2- (2-hydroxy-5-tert-octylphenol) benzotriazole (product of Ciba-Geigy Corporation, trade name: Tinuvin 329) and 2,2'-methylene- - (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazole-2-substituent) phenol] is selected.

In addition, the ultraviolet absorber may be used alone or in combination of two or more. The ultraviolet absorber to be added is preferably in the range of 0.5 wt% to 15 wt%, more preferably 1 wt% to 10 wt%, based on the weight of the coating of the acrylic resin. If the addition amount of the ultraviolet absorber is less than 0.5% by weight, a large change in hue of the resin and poor weather resistance (i.e., weatherability) will result. If the addition amount of the ultraviolet absorber exceeds 15% by weight, the color tone of the resin and the brightness of the light will deteriorate.

In addition, in the embodiments, the fluorescent agent optionally added is a fluorescent agent which absorbs ultraviolet light and re-emits the visible light, for example, a white resin or a blue white resin, The color tone of the resin can be changed without any work. Examples of the material of such a fluorescent material include diphenylethylene-based compounds, benzimidazole-based compounds, benzoxazole-based compounds, phthalimide-based compounds, rhodamine-based compounds, coumarin-based compounds, oxazole-based compounds and the like. In one embodiment, the fluorescent agent may be optionally added in an amount of 0.001 wt% to 0.1 wt%, preferably 0.002 wt% to 0.08 wt%, of the coating of the acrylic resin. In the compositions of the embodiments, the fluorescent agent may be selectively added to the above range to improve the brightness and hue of light.

In a comparative experiment, several embodiments and results are provided below for the purpose of describing the embodiments. The structure of the light-transmitting plate 1 will be described with reference to Figs. 1 and 2 and the description above. Comparative Examples 1 to 2 and Examples 1 to 6 were provided as follows:

Comparative Examples 1 to 2 and Examples 2 to 3 and 5 provide a light-transmitting plate having a thickness of 1.2 mm, respectively. Examples 1, 4 and 6 provide a light-transmitting plate having a thickness of 2.2 mm, respectively. The light transmissive plates of Examples 1 to 6 and Comparative Examples 1 and 2 each have a plurality of protrusions 20 formed on the first surface 101 of the main body 10 and projecting from the first surface 101 . The protrusion 20 and the main body 10 are integrated as a single component.

Luminance, and average luminance uniformity of four edges:

The luminance measurement is performed by a BM-7A luminance colorimeter (TOPCON CORPORATION, Japan). The light-transmissive plates of Examples 1 to 6 and Comparative Examples 1 to 2 are disposed on a lighting module having an LED array for luminance measurement. The luminance was obtained by dividing the central luminance value of one of Examples 1 to 6 and Comparative Examples 1 and 2 by the central luminance which is a standard value (a commercially available diffusion plate DS601A manufactured by Chisso Corporation of Taiwan) (as 100%) It is a standardized value. The average luminance uniformity of the four corners is obtained by dividing each of the luminance values obtained at the four corners of the module by the central luminance value of the module and then calculating the average of these four values.

Illumination:

The illuminance measurement is performed by a 3D laser scanning confocal microscope (model: VK-X100 series, KEYENCE CORPORATION). According to the method in JIS B0601-2001, the sampling positions are randomly selected in the region of 10 mm x 10 mm, and the roughness parameters such as Ra, etc. can be obtained from the surface roughness profile (50 times magnification lens) as measured .

The height Hp measured from the platform-top surface to the first surface and the width Ws of the vertical protrusion of the slope on the first surface and the angle between the slope and the first surface:

The light transmissive plates of Examples 1 to 6 and Comparative Examples 1 to 2 were measured by a 3D laser scanning confocal microscope to obtain a cross-sectional profile, where each of the cross-sectional profiles was obtained by measuring two points on the platform- Distance (i. E., The maximum width (Wm) of the platform-top surface). The height Hp of each cross-sectional profile is then measured from the platform-top surface 201 of the protrusion 20 to the first surface 101 and the height Hp of each cross- Is also measured. In Examples 1 to 6 and Comparative Examples 1 to 2, the width Ws of the vertical protrusion is a width value extending from the maximum width Wm of the platform-top surface toward the left side of the protrusion. However, the present invention is not limited to this. The width Ws of the vertical protrusion may be any width value extending from the maximum width Wm of the platform-top surface toward any side of the protrusion. Further, the angle of alpha 1 (or alpha 2) can be calculated using the values of (Hp) and (Ws), and the angle of 180- alpha 1 (or (180- alpha 2) Can be obtained.

Distance between adjacent protrusions:

Distance measurement is performed by a 3D laser scanning confocal microscope (model: VK-X100 series, KYENS). Twenty samples are randomly selected in the measurement regions of 10 mm x 10 mm in Examples 1 to 6 and Comparative Examples 1 and 2. According to this measurement result, the minimum distance _Max between the adjacent protrusions represents the maximum value of the minimum distance between the adjacent protrusions in the measurement area. The minimum distance _Min between adjacent protrusions represents the minimum value of the minimum distance between adjacent protrusions in the measurement area. The distance between the adjacent protrusions is 0.01 mm to 1 mm (10 m to 1000 m), preferably 0.015 mm to 0.95 mm (15 m to 950 m).

Maximum width (Wm) and minimum length (Dm) of the platform-top surface 201:

Width and length measurements are performed by a 3D laser scanning confocal microscope (model: VK-X100 series, KYENS). In order to obtain a range of the maximum width (Wm) of the platform-upper surface and a range of the minimum length (Dm) perpendicular to the maximum width (Wm), 20 samples were prepared in the same manner as in Examples 1 to 6 and Comparative Examples 1 and 2 And is selected randomly in a measurement area of 10 mm. The maximum width Wm of the platform-top surface 201 of the protrusion 20 is in the range of 0.15 mm to 8 mm (150 m to 8000 m), preferably 0.155 mm to 7 mm, more preferably 0.158 mm To 6 mm. The minimum length Dm of the platform-top surface 201 of the protrusion 20 is in the range of 0.03 mm to 1.5 mm, preferably in the range of 0.05 mm to 1.2 mm, more preferably 0.07 mm to 1.05 mm .

Protrusion area / protrusion circumference (占 퐉), protrusion area ratio:

In Examples 1 to 6 and Comparative Examples 1 and 2, the measurement was performed by capturing an image within a measurement area of 6.821 mm x 5.312 mm (area: 36.233 mm < 2 >) and measuring all single Is performed by an optical microscope (model: Bx-60 F5, Olympus Corporation) by calculating the area and circumference of the protrusions. The area of the protrusion / the periphery of the protrusion is defined as the total area of the protrusion located in the measurement area divided by the whole circumference of the protrusion located in the measurement area. The protrusion area ratio is defined as the total area of protrusions located within the measurement area divided by the area of the measurement area (36.233 mm 2). Reference is made to Figs. 3A to 3G, which illustrate an image captured by an optical microscope of a measurement portion of each of the light-transmitting plates of Comparative Example 1, Comparative Example 2, and Examples 2 to 6. 3A to 3G, each of the light-transmissive plates includes a plurality of protrusions formed on a first surface of the body and protruding from the first surface, wherein a perimeter outline boundary of the protrusions has an area of the protrusions, The thick boundary represents the inclined surface, and the coarse portion within the thick boundary of the protrusion represents the platform-top surface (with irregular shape) of the protrusion. In one embodiment, the ratio of the projected area to the projected area is in the range of 100 탆 to 200 탆, preferably in the range of 110 탆 to 190 탆, more preferably in the range of 115 탆 to 175 탆. In one embodiment, the protrusion area ratio is in the range of 35% to 70%, preferably in the range of 38% to 68%, more preferably in the range of 40% to 66%.

The measurement results are listed in Table 1.

According to the result of the integration performance of the average luminance uniformity and the center luminance at the four corners in Table 1 (i.e., the value of the "average luminance uniformity of the four corners + the center luminance (%)"), Transmissive plate in Examples 1 to 6 has better optical performance when the peripheral ratio is in the range of 100 mu m to 147 mu m.

4 illustrates a backlight module of an embodiment of the present invention. The backlight module 400 of this embodiment could be a direct-lighting backlight module of a flat panel display. The backlight module 400 includes a diffuser plate 410, at least a light source 420 (light source shown in FIG. 4), and a frame 440. The frame 440 defines a receiving space 442 and the diffuser plate 410 and the light source 420 are positioned within the receiving space 442 where the diffuser plate 410 is disposed above the light source 420 . A diffuser plate 410 such as any light transmissive plate or the like in Embodiments 1 to 6 includes a body 10 having a first face 101 and a second face 101 on the first face 101 of the body 10 And protruding from the first surface (101). The light source 420 and the first surface 101 are disposed opposite to each other, which means that the first surface is the incident surface. Each of the light sources 420 includes a substrate 422 and a light emitting unit 424 disposed on the substrate 422 wherein an example of the light emitting unit 424 is a light emitting diode (LED) or other type of light emitting device . The light emitted from the light emitting unit 424 is incident on the diffusion plate 410 and emitted from the second surface 102 of the diffusion plate 410 to form a surface light source having high luminance and high luminance uniformity.

In one embodiment, the backlight module 400 may be applied as a backlight module of a display device such as a liquid crystal display or the like.

According to the above embodiment, the light-transmissive plate in any one of the embodiments was designed by forming protrusions on the body, and the protrusions protruded from the body. When the light-transmissive plate of the embodiment (as shown in Fig. 1) is applied as a diffuser plate, the first surface 101 with the protrusions faces the light source (s) of the backlight module. Thus, the first surface 101 is a light incidence surface, and the second surface 102 of the main body 10 is a light exit surface. The display device to which the light-transmissive plate of the present embodiment is applied as the diffusing plate of the backlight module has a light-emitting region of high luminance, and the luminance uniformity can be increased as compared with a commercially available diffusing plate. Therefore, with respect to the display device to which the light-transmissive plate of the present embodiment is applied, the image display result can be considerably improved, and the number of the optical films generally adopted in the ordinary display device can be reduced, The display device (particularly for a large-sized display device) can be made lighter and thinner. In particular, a large size display device would be beneficial from the design of the light-transmitting plate of the present invention.

While the present invention has been described by way of example and in terms of exemplary embodiment (s), it should be understood that the invention is not limited thereto. On the contrary, the invention is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims should therefore be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.

Claims

As a light-transmissive plate,
A body having a first side; And
A protrusion formed on the first surface and protruding from the first surface of the body,
Wherein the protrusions have a platform-top surface having an irregular shape and an inclined surface connecting the first surface and the platform-top surface, wherein the platform having the irregular shape - the height measured from the top surface to the first surface ) Is in the range of 5 占 퐉 to 40 占 퐉, and the ratio of the area of the projecting portion to the periphery of the projecting portion is in the range of 100 占 퐉 to 147 占 퐉.

The light-transmitting plate according to claim 1, wherein the protrusions have an area-to-periphery ratio ranging from 110 탆 to 145 탆.

The light-transmitting plate according to claim 1, wherein the protrusions have an area-to-periphery ratio of from 115 mu m to 144 mu m.

The light-transmitting plate according to claim 1, wherein the maximum width (Wm) of the irregular-shaped platform-upper surface is in the range of 0.15 mm to 8 mm.

The light-transmitting plate according to claim 1, having a thickness in the range of 0.5 mm to 6 mm.

The light-transmitting plate according to claim 1, wherein the vertical protrusion of the inclined surface on the first surface has a width (Ws) in the range of 10 mu m to 160 mu m.

The light-transmitting plate according to claim 1, wherein an angle range between the inclined surface and the first surface is 120 ° to 177 °.

The light-transmitting plate according to claim 1, wherein the platform-upper surface having the irregular shape of the protrusion means that the vertical protrusion of the protrusion on the first surface along the thickness direction of the body has an irregular shape.

The light-transmitting plate according to claim 1, wherein the light-transmissive plate is made of a transmissive resin.

The light-transmitting plate according to claim 1, further comprising a plurality of diffusion particles diffused in the body and the protrusions, wherein the average particle size of the diffusion particles is in a range of 0.1 to 30 탆.

The light-transmitting plate according to claim 1, comprising a plurality of projections protruding from the first surface of the body, wherein a minimum distance between adjacent projections is in a range of 10 탆 to 1000 탆.

2. The method of claim 1, wherein a portion of the first surface outside of the protrusion has a surface roughness (Ra) of less than 0.1 占 퐉, and the platform-top surface with the irregular shape has a surface roughness (Ra) And a light transmitting plate.

The method of claim 1, wherein a portion of the first surface outside of the protrusion has a surface roughness (Ra) in the range of 0.01 탆 to 0.08 탆, and the platform-top surface having the irregular shape is in the range of 0.01 탆 to 0.1 탆 And a surface roughness (Ra) of the light-transmitting plate.

2. The method of claim 1, wherein a portion of the first surface outside of the projection has a surface roughness (Ra) in the range of 0.02 mu m to 0.07 mu m, and the platform-top surface having the irregular shape is in the range of 0.03 mu m to 0.25 mu m And a surface roughness (Ra) of the light-transmitting plate.

The light-transmitting plate according to claim 1, wherein the body has a second surface opposite to the first surface, and the second surface has a surface roughness (Ra) in a range of 3 탆 to 30 탆.

16. The light-transmitting plate according to claim 15, wherein the first surface is a light incidence surface and the second surface is a light emergence surface.

The light-transmitting plate according to claim 1, having a light transmittance in the range of 50% to 70%.

The light-transmitting plate according to claim 1, wherein the body and the protrusion are integrated as one component.

2. The light-transmitting plate of claim 1, wherein the platform-upper surface of the protrusion is substantially parallel to the first surface of the body.

2. The apparatus of claim 1, wherein the protrusions have a first sloped surface and a second sloped surface opposing and corresponding to opposite ends of a maximum width (Wm) of the irregularly shaped platform-top surface, A second inclined surface connects the first surface and the platform-upper surface having the irregular shape, a first angle formed between the first inclined surface and the first surface, and a second inclined surface between the second inclined surface and the first surface Wherein the first angle is different from the second angle, and the second angle is different from the second angle.

2. The apparatus of claim 1, wherein the protrusions have a first sloped surface and a second sloped surface opposing and corresponding to opposite ends of a maximum width (Wm) of the irregularly shaped platform-top surface, A second inclined surface connects the first surface and the platform-upper surface having the irregular shape, a first angle formed between the first inclined surface and the first surface, and a second inclined surface between the second inclined surface and the first surface Wherein the first angle and the second angle are in the range of 120 ° to 177 °, respectively.

2. The light-transmitting plate according to claim 1, wherein the irregular-shaped platform-upper surface has a minimum length perpendicular to the maximum width of the platform-upper surface, and the minimum length ranges from 0.03 mm to 1.5 mm.

The light-transmitting plate according to claim 1, wherein the ratio of the area of the projecting portion to the area of the first surface ranges from 35% to 70%.

As a backlight module,
Light source; And
A light-transmissible plate according to any one of claims 1 to 23,
Wherein the light source and the first surface are disposed opposite.

25. The backlight module of claim 24, wherein the first surface is a light incidence surface.

A display device comprising a backlight module according to claim 24.