TWI380088B - Optical sheet, backlight unit, and liquid crystal display - Google Patents

Description

1380088 IX. Description of the Invention: The present invention relates to an optical sheet, a backlight unit including the optical sheet, and/or a liquid crystal display including the same. [Prior Art] The display field can visually display information of different electrical signals. In the field of display, various types of flat panel displays have been proposed which have excellent characteristics such as a thin profile, light weight, and low power consumption. In addition, a flat panel display will be used to replace the cathode ray tube (CRT). Examples of flat panel displays include liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), and electroluminescent displays (Ele®. Due to the high contrast ratio and good dynamic display characteristics, the liquid crystal display. Therefore, it can be used as a display panel of a notebook computer, a display of a personal computer, and/or a TV display. The liquid crystal display can be considered as a light receiving display. The liquid crystal display can include a liquid crystal display panel for displaying an image and being located in the liquid crystal display. a backlight unit for providing light of the liquid crystal display panel. The backlight unit may include a light source and an optical sheet. The optical sheet may include a diffusion sheet, a ruthenium sheet, or a protective sheet. If the backlight unit is provided to the liquid crystal display panel When the uniformity of the illuminance is lowered, the display quality of the liquid crystal display is lowered. The diffusion sheet allows the light to be uniformly diffused onto the entire surface of the display region of the liquid crystal display panel to prevent the illuminance uniformity of the light from being lowered. Use this diffusion sheet to ensure high optical diffusivity and illuminance uniformity [Embodiment] The present invention has been made in view of the above-described problems, and an object thereof is to provide a method and control method for stopping operation of a vacuum pump and an operation stop control. 1 is a cross-sectional view of an optical sheet in accordance with an exemplary embodiment of the present invention. Other embodiments and architectures are also within the scope of the present invention. More specifically, FIG. 1 shows an optical sheet 100 including a reflective polarizing film. And a first diffusion layer φ 120 (or a diffusion unit) on the reflective polarizing film 110. The first diffusion layer 120 may include a first light transmitting material 121 and a plurality of first diffusion particles 122. The first diffusion particles 122. Can be embedded in the first light transmissive material 121. The reflective polarizing film 110 can transmit or reflect light from a light source. The reflective polarizing film 110 can include a first layer 111 formed of a polymer and disposed adjacent to each other. The second layer 112 of the first layer 111. The second layer 112 may be formed of a polymer having a refractive index different from the polymer forming the first layer 111. The reflective polarizing film 110 may have a structure in which the first layer 111 and the second layer 112 are alternately stacked in a repeated manner. The first layer 111 may be formed of polymethyl methacrylate (PMMA), and The second layer 112 may be formed of a polyester. Part of the light from the light source may be transmitted through the reflective polarizing film 110, and another portion of the light from the light source may be reflected toward the light source positioned below the reflective polarizing film 110. The light reflected toward the light source may be reflected again and may be incident on the reflective polarizing film 110. Part of the light incident on the reflective -6-1380088 polarizing film 110 may be transmitted through the reflective polarizing film 110 and incident on Another portion of the light on the reflective polarizing film 110 can be reflected again toward the light source positioned below the reflective polarizing film 110. In other words, since the reflective polarizing film 110 has a structure in which the first layer 111 and the second layer 112 are alternately stacked in a repeated manner, the reflective polarizing film 110 can utilize a principle in which the polymer molecular system is oriented in one direction. The light efficiency from the Φ source is improved by transmitting polarized light in a direction different from the orientation of the molecules and reflecting the polarized light in the same direction as the orientation of the molecules. The reflective polarizing film 110 may have a thickness of about 100 um to 300 μm, depending on the size of the display device. When the thickness of the reflective polarizing film 110 is equal to or greater than ΙΟΟμπι, the principle of polarization and reflection can be used to improve the luminous efficiency. When the thickness of the reflective polarizing film 110 is equal to or less than 300 μm, a thin-profile optical sheet can be realized. The first diffusion layer 120 can use the first diffusion particles 122 (and/or plural bubbles) in the first diffusion layer 120 to diffuse the light from the external source. The first light transmissive material 121 forming the first diffusion layer 120 may include, for example, an unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, n-Butyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, methylol acrylamide, glycidyl methacrylate, Ethyl acrylate, isobutyl acrylate, n-butyl acrylate, polymer such as 2-ethylhexyl acrylate, 2- -7- 1380088 ethyl acrylate or 2-ethyl acrylate The propylene-based material, the urethane-based material, the epoxy-based material, the melamine-based material, the polycarbonate, and the polystyrene may also use other materials. The first diffusion in the first diffusion layer 120 The particles 122 can be beads (such as disposed in a cavity). Each of the first diffusion particles 122 may be formed of a material selected from the group consisting of polymethyl methacrylate (PM Μ A), polystyrene, ruthenium, and combinations thereof. A plurality of the beads may be exposed outside of the first diffusion layers 12A. φ The first diffusion layer 120 may further or alternatively include a plurality of bubbles for diffusing light from an external source. The bubbles may be disposed in place of the first diffusion particles 122, or may be disposed with the first diffusion particles I". The first diffusion layer 120 may include the first light transmissive material 121' based thereon. 1 to 50 parts by weight of the first diffusion particles 122. When the amount of the first diffusion particles 122 is equal to or greater than 10 parts by weight based on the first light transmissive material 121, it can be prevented (or lowered) from The light of the light source using the beads (or the bubbles) is difficult to diffuse. When the number of the first diffusion particles 122 is equal to or less than 50 parts by weight based on the first light transmitting material 121', it can be prevented A decrease in the transmission of light from the light source. The diameters of the different first diffusion particles 122 distributed in the first light transmissive material 121 may be mutually different (or non-uniform). 122 may be circular, elliptical, snowman shaped, and/or equal circular. Other shapes may also be used. The first diffusing particles 122 may be -8- in the first light transmissive material 121.

There is a non-uniform distribution at 1380088. The first diffusion particles 122 may have a diameter of about 0.5 μm. When the diameters of the first diffusion particles 122 are small, the optical thin optical diffusivity may increase the density of the diffusion particles 122 in the first diffusion layer 120. To improve. However, when the diameter of the first 1 22 is very small, it will occur from the external source. Therefore, when the diameter of the first diffusion particles 122 is equal to 55 μm, the optical diffusivity of the optical sheet 100 can be improved (or at least minimally) the light interference. When the diameter of the first diffusion particles 122 is large, the first diffusion layer 120 is required to ensure the number of the optical sheets 100, and thus it may be difficult to manufacture a thin-shaped optical thin. The diameter of a diffusion particle 122 is equal to or less than the extent to which the thin profile of the optical sheet 100 can be achieved without reducing (or greatly reducing) the optical diffusion coefficient of the optical sheet 100. A backlight unit including the optical sheet is operable and illustrated as light generated by a light source can be incident on the optical sheet. A portion of the light incident on the sheet collides with the scattered particles of the first diffusion unit, and the path of travel of the light changes. Another portion of the light incident on the sheet passes through the first diffusion layer toward a liquid crystal display panel. Light colliding with the first diffusing particles collides with other first diffusing particles adjacent to the diffusing particles and reroutes the path of the line. Part of the light (the path of the first diffusion particles whose traveling path is changed twice to 10 μm 0 piece 100 is dry or larger than that does not occur to form a thick diffusion system 1 00 0 due to 10 μm , the body does not go down. The first part of the optical expansion, such as the first expansion of the optical radiation surface collision, changes the light portion) through the radiation surface of the first diffusion layer toward the liquid crystal display portion. The light (the portion where the traveling path changes twice) collides with the same and changes the traveling path of the light. Light passing through the radiation surface of the first diffusion layer can be displayed on the panel by the liquid crystal. The optical sheet 100 may further include a first adhesive layer 130 between the reflective polarizing film u 层 layer 120. The first diffusion layer 12 can be formed on the film 110 by combining the first light transmitting material 121 with the sub-122 (and/or bubble) and applying the mixture to the reflective polarizing film. The first light transmissive material 121 and the 122 (or bubbles) may be formed by using an extrusion molding method or an injection film form, and then adhesively coating the film 110 with an adhesive, and the first The diffusion layer 120 is formed on the film 110. The first adhesive layer 130 may be coated on the film 110 to form the first diffusion layer 120. The first adhesive layer 130 may be selected from the group consisting of acrylic adhesives, enamel adhesives, and combinations thereof. Examples of the acrylic adhesive include alkyl acrylate such as butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate and benzyl propyl acrylate, butyl acrylate, 2-ethyl methacrylate P-hexyl ester, methyl display panel. Another first diffusion particle is incident on the first diffusion particle 110 such as the first diffusion or the reflective polarization thinning method, wherein a first diffusion particle is attached to the reflection biased to the reflective polarization The materials of the reflective polarizing thinner and the rubber-based group are formed into an acid ethyl ester, an acryl octyl acrylate, and an alkyl methacrylate such as cyclohexyl methacrylate-10- 1380088 and benzyl methacrylate. The rubber-based adhesive may include natural rubber, isoprene rubber, styrene-butadiene rubber, recycled rubber, polyisobutylene rubber, benzene canoprene-styrene rubber, and styrene-butene Diene-styrene can be used as the main constituent block copolymer. An example of the lanthanide-based adhesive may include a dimethyl siloxane-based material as a diphenyl siloxane-based material. Considering the light transmittance and the adhesive property, the thickness of the first adhesive layer 13〇 may be approximately Ιμιη to ΙΟμιη. Other thicknesses can also be used. The thickness of the first adhesive layer 130 may be the distance between the highest point of the first surface 131a and the second surface 131b; and the average 値 of the distance between the first surface 131a and the lowest point of the two surfaces 131b. The first adhesive 130 may have an average thickness of from about 1 μm to about 10 μm. The distance T1 between the first surface 131a and the first position of the second surface 131b may be different from the distance T2 between the first surface 131a and the second position of the second surface 13. The equidistances T1 and T2 may satisfy the following formula: 10ηη^|Τ1·Τ2|$2μιη°Τ1 represents a first thickness between the second surface 13 1b of the first surface 131a, and T2 represents the first surface 131a A second thickness between the second surface 131b. Referring to Fig. 1, the vertical distances T1 and T2 are distances along a vector substantially perpendicular to the plane of the reflective polarizing film 1. Table 1 below indicates the diffusion effect and illuminance of the optical sheet 1 取决于 depending on the relationship between the equidistances T 1 and T 2 . In the following Table 1, X'c and ◎ represent the poor, good, and excellent states of these characteristics, respectively. Rubber and rubber and the first layer of the table lb square and Table 1 -10 The -11- 1380088 Table 1

-Τ2| (4) Diffusion effect illuminance 0.005 X ◎ 0.01 〇 ◎ 0.03 〇 ◎ 0.05 〇〇 0.1 〇〇 0.5 〇〇 1 ◎ 〇 2 ◎ 〇 5 ◎ ., X As shown in Table 1 above, when the distances T1 and T2 satisfy the following The equation: 10 nmS|Tl-T2| causes light from the source to diffuse due to a curved or uneven surface on one surface of the first adhesive layer 130. When the distances T1 and T2 satisfy the following equation: | T1-T2 | £2μηη, the illuminance reduction due to the large height difference of the first adhesive layer 130 can be prevented. The difference between the refractive index of the first light transmitting material 121 and the refractive index of the first adhesive layer 130 may be less than or equal to 0.2. The following Table 2 indicates the illuminance characteristics and the light loss preventing efficiency of the optical sheet 100 depending on the difference between the refractive index of the first light transmitting material 112 and the refractive index of the first adhesive layer 130. In the following Table 2, X, 〇, and ◎ represent the poor, good, and excellent states of these characteristics, respectively. -12- 1380088 Table 2 Illuminance characteristics Light loss prevention efficiency Difference between the refractive index of the first light transmitting material and the first adhesive layer

0 ◎ ◎ 0.05 ◎ ◎ 0.1 〇 〇 0.15 〇 〇 0.2 〇 〇 0.25 X X 0.3 X X

As shown in the above Table 2, when the difference 折射率 between the refractive indices of the first light transmitting material 121 and the first adhesive layer 130 is equal to or greater than 〇, light loss from the light source can be prevented and improved. Its illumination. When the difference between the refractive indices of the first light transmitting material 1 21 and the first adhesive layer 130 is less than or equal to 0.2, the light emitted from the light source is in the first adhesive layer 130 and the first The interface between the diffusion layers 120 is reflected or refracted. Therefore, the illuminance caused by the loss of light on the edge is prevented from being lowered. The optical sheet 100 can prevent light loss from the light source and can improve the illuminance by making the difference 折射率 between the refractive indices of the first light transmitting material 121 and the first adhesive layer 130 less than or equal to 0.2. Figure 2 is a cross-sectional view of an optical sheet in accordance with an illustrative embodiment of the present invention. Other specific embodiments and architectures are also within the scope of the invention. As shown in FIG. 2, the optical sheet 200 may include a reflective polarizing film 210, a first adhesive layer 230' on the reflective polarizing film 21A, and a first diffusion on the first adhesive layer 230 on the scale of -13-1380088. Layer 22 0. The negative may include a first light transmissive material 221 and a plurality of first diffusing plurality of beads or bubbles). The first diffusion particles 222 are light transmissive in the material 221. The reflective polarizing film may include a first layer 211 and a distance adjacent to the first layer 212. The first adhesive layer 230 may have a distance between a highest point of the first surface 23 1b and the first surface. The average 値 of the distance between the lowest points of the φ surface 231b. The first average thickness may be approximately Ιμιη to ΙΟμηι. The optical sheet 200 is disposed on the second adhesive layer 240 of the reflective polarizing film 210, and the second adhesive layer 240 is 250°. The second adhesive layer 240 may include a fourth surface 241b facing each other. The third surface 241a and/or the fourth curved surface or the uneven surface. Φ Considering the light transmittance and adhesion characteristics, the second adhesion can be about Ιμιη to ΙΟμιη. Other thicknesses can also be used. The thickness of the second adhesive layer 240 may be the average distance between the highest point of the fourth three surface 24 1a and the distance between the lowest points of the third third surface 241a. The average thickness of 240 may be approximately Ιμιη to ΙΟμιη. The distance T3 between the fourth surface 241b and the third surface 241a may be different from the fourth surface 241b and the third diffusion layer 220 particles 222 (and/or embedded in the first polymer-shaped 21 1st The second layer 231a and the second surface 231a and the second adhesive layer further include a second diffusion layer three surface 241a and a surface 24 1 b which may be the thickness surface 241b and the third surface 24 1 b of the layer 240. And the second adhesive layer: a distance T4 between the first and second positions of the surface 241a between the first positions 241a. Similar to the first adhesive layer 2 30, the equidistances Τ3 and Τ4 can satisfy the following equation: 10nmS| T3-T4|s2pm»T3 represents a third thickness between the third surface 241a and the fourth surface 241b, and T4 represents a fourth thickness between the third surface 24U and the fourth surface 241b. 2, the vertical distances T3 and T4 are distances along a vector substantially perpendicular to the plane of the reflective polarizing film 210. When the distances T3 and T4 satisfy the following equation: 10 nmS | T3-T4 | The light emitted by the light source is curved or uneven due to the surface of the second adhesive layer 240 When the distances T3 and T4 satisfy the following equation: | T3-T4 | ΐ 2μηη, the illuminance can be prevented from being lowered due to the excessive height difference of the second adhesive layer 240. The second diffusion layer 250 can be the same or Similar to the first diffusion layer 220. The second diffusion layer 25 0 can diffuse light from the external light source through the plurality of second diffusion particles 252 (and/or bubbles) in the second light transmitting material 251. The second light transmissive material 251 of the second diffusion layer 250 may include, for example, an unsaturated polyester, methyl methacrylate 'ethyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, acrylic acid. , methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, n-butyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate , acrylamide, hydroxymethyl acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate polymer, 2-ethyl acrylate Ethyl ester copolymer or 2-ethylethyl acrylate tri-copolymer -15- 1380088 Propionic acid-based material, urethane-based material, epoxy-based material, melamine-based material, polycarbonate, and poly Styrene. Other materials may also be used. Each of the second diffusion particles 252 in the second diffusion layer 250 may be a bead (such as in the form of a cavity). The second diffusion particles 252 Each may be formed from a material selected from the group consisting of polymethyl methacrylate (pMMA), polystyrene, sand, and combinations thereof. A plurality of the beads may be exposed outside of the first diffusion layer 220 and/or the second diffusion layer 250. The second diffusion layer 250 may further or alternatively include a plurality of bubbles 'to diffuse light from the external source. The bubbles may be provided to replace the second diffusion particles 25 2 or may be provided in the same manner as the second diffusion particles 252. The second diffusion layer 250 may include, based on the second light transmissive material 251, 1% to 5% by weight of the second diffusion particles 252. When the number of the second diffusion particles 252 is equal to or greater than 10 parts by weight based on the second light transmitting material 251, it is possible to prevent (or reduce) the light from the light source using the ? beads from being difficult to diffuse. When the number of the second diffusion particles 252 is equal to or less than 5 parts by weight based on the second light transmissive material 251', the decrease in the transmission of light from the light source can be prevented. The diameters of the different second diffusion particles 252 distributed in the second light transmitting material 251 may be different from each other (or non-uniform). The second diffusion particles 252 may be circular, elliptical or snowman shaped. And/or equal circles. Other shapes can also be used. The first diffusion fci 252 may be non-uniformly distributed at each of the second light transmissive materials 251 from 1616 to 1380088. The second diffusion particles 252 may have a diameter of about 55 μmη to ΐ〇μιη. When the diameter of the second diffusion particles 252 is small, the optical diffusivity of the optical sheet 200 can be improved by increasing the density of the second diffusion particles 252 in the second diffusion layer 250. However, when the diameter of the second diffusion particles 252 is very small, light interference from the external light source occurs. Therefore, when the diameter of the second diffusion particles 25 2 is equal to or larger than 〇.5 μm, the optical diffusibility of the optical sheet 2G0 can be improved so that the light interference does not occur (or will occur to a minimum). When the diameter of the second diffusion particles 25 2 is large, the second diffusion layer 250 may be formed thick to ensure optical diffusibility of the optical sheet 200, and thus it may be difficult to manufacture the thin-profile optical sheet 200. Therefore, when the diameter of the second diffusion particles 252 is equal to or smaller than ΙΟμηη, the thin profile of the optical sheet 200 can be achieved without reducing (or substantially not reducing) the degree of optical diffusion coefficient of the optical sheet 200. The second adhesive layer 240 can be used to adhere the reflective polarizing film 210 to the second diffusion layer 250 and/or can be the same as the first adhesive layer 230. The second adhesive layer 240 may be formed of a material selected from the group consisting of an acrylic adhesive, a rubber adhesive, an enamel adhesive, and a combination thereof. Examples of the acrylic bond adhesive include alkyl acrylate such as ethyl acrylate, butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate and benzyl acrylate, and such as methyl An alkyl methacrylate of butyl acrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate and benzyl methacrylate. -17- 1380088 The rubber-based adhesive may include natural rubber, isoprene rubber, styrene-butadiene rubber, recycled rubber, polyisobutylene rubber, styrene-isoprene-styrene rubber, and A styrene-butadiene-styrene rubber is a block copolymer mainly composed. The exemplified by the dicing adhesive may include a polydimethyl siloxane material and a phenyl silicate material. The refractive index of the second light transmitting material 251 and the refractive index of the second adhesive layer 24 〇 The difference can be substantially less than or equal to 〇. 2. Φ When the difference 折 between the refractive indices of the second light transmitting material 251 and the second adhesive layer 240 is equal to or greater than 〇, light loss from the light source can be prevented and the illuminance can be improved. When the difference between the refractive indices of the second light transmitting material 251 and the second adhesive layer 240 is less than or equal to 0.2, the light emitted from the light source is in the second adhesive layer 240 and the second The interface between the diffusion layers 250 is reflected or refracted. Therefore, the illuminance caused by the loss of light at the edge can be prevented (and/or reduced). The optical sheet 200 prevents loss of light from the light source and can improve the illuminance by making the difference 折射 of the refractive index between the second light transmitting material 251 and the second adhesive layer 240 less than or equal to 0.2. 3A and 3B are exploded perspective and cross-sectional views illustrating the architecture of a backlight unit including an optical sheet in accordance with an exemplary embodiment of the present invention. Other specific embodiments and architectures are also within the scope of the invention. Figures 3A and 3B show an edge type backlight unit. Since the structure of the optical sheets shown in Figs. 3A and 3B is substantially the same as those of the above-described optical sheets, further explanation may be simplified or may be omitted entirely. -18- 1380088 As shown in Figures 3A and 3B, the backlight unit 300 can be incorporated into a crystal display and can provide light to a liquid panel included in the liquid crystal display. The backlight unit 300 may include a light source 320 and an optical thin, and the backlight unit 300 may further include a light guide 340 (or a light guide plate), a reflective reflector, a bottom cover 366, and a mold frame 370. The light source 320 can generate light using a drive received from outside the light source and can emit the generated light. # The light source 320 can be along one side of the long axis of the light guide 340. The light source 320 can also be disposed on the light guide 340 i. Light from the light source 320 can be directly incident on the light guide 340. Light from the light source 320 can be reflected from a housing 322 that surrounds the light source 320, for example, Approximately 3/4 of the surface of the source 320 is live, and then the light can be incident on the light guide 340. The light source 320 can be a cold cathode fluorescent lamp (CCFL), a heat negative (HCFL), an external electrode fluorescent lamp (EEFL), and a light emitting diode. Other light sources can also be used. The optical sheet 330 can be disposed on the light guide 340. The 330 can focus the light from the source 320. The optical sheet 330 may include a reflective polarizing film, a first adhesive layer on one surface of the film, and the first adhesive first diffusion layer. The first diffusion layer may include a first light transmissive material number of first diffusion particles (and/or beads). The difference 折射率 between the refractive indices of the first light transmissive material of the first adhesive layer may be less than or included in the liquid crystal display surface 330. The device 350 (or the moving power is disposed on the light: on both sides. Or, the optical sheet of the peripheral fluorescent lamp (LED) on the outside of the light source reflects the material on the polarizing layer and the complex refractive index is equal to 0.2. -19- 1380088 can prevent the light loss of the optical sheet 30 and improve the illumination of the optical sheet 30. Therefore, the display quality of the backlight unit 300 can be improved. The diffusion sheet 332 and/or the sheet 331 can be provided. Between the light guide 340 and the optical sheet 330. The light guide 340 can face the light source 320. The light guide 34 can direct the light to emit light from the light source 32 in an upward manner.

The reflector 350 can be disposed below the light guide 340. The reflector 350 can reflect light from the source 3 20 in an upward manner, and then the light can be radiated downward through the light guide 340. The bottom cover 360 can include a bottom portion 362 and a side portion 364 extending from the bottom portion 362 to form a receiving space. The receiving space can accommodate the light source 320, the optical sheet 330, the light guide 340, and the reflector 350. The frame 370 can be approximately a rectangular frame. The mold frame 370 can be fixed to the bottom cover 360 from the upper side of the bottom cover 360 with the top end facing downward. Figure 3C shows a backlight unit in accordance with an illustrative embodiment of the present invention. Other specific embodiments and architectures are also within the scope of the invention. As shown in FIG. 3C, the backlight unit 300 is included in addition to the second diffusion layer 250 and the second adhesive layer 240 except the first diffusion layer 220 and the first adhesive layer 230. The backlight unit 300 shown in FIGS. 3A and 3B may be substantially the same. Therefore, further description of the backlight unit 300 will be omitted for convenience of explanation. 4A and 4B are exploded perspective and cross-sectional views showing the structure of a backlight unit in accordance with an exemplary embodiment of the present invention. Other specific embodiments and architectures are also within the scope of the invention. -20- 1380088 Figures 4A and 4B show a direct backlight unit. Since the backlight unit 400 shown in FIGS. 4A and 4B can be substantially the same as the backlight unit 300 shown in FIGS. 3A and 3B (except for the position of the light source and depending on the position of the light source, the constituent elements are changed), Therefore, further explanation may be simplified or may be omitted entirely. As shown in Figures 4A and 4B, the backlight unit 400 can be included in a liquid crystal display* and can provide light to a liquid crystal display panel included in the liquid crystal display.

The backlight unit 400 can include a light source 420 and an optical sheet 430. The backlight unit 400 can further include a reflector 450, a bottom cover 460, and a diffusion plate, and the light source 420 can be disposed under the diffusion plate 480. Therefore, light from the light source 420 can be directly incident on the diffusion plate 480. The optical sheet 430 can be disposed on the diffusion plate 480. The optical sheet 430 can focus light from the source 420. The optical sheet 430 may include a reflective polarizing film, a first adhesive layer on one surface of the reflective polarizing film, and a first diffusion layer on the first adhesive layer. The first diffusion layer can include a first light transmissive material and a plurality of first diffusion particles (and/or beads). The difference between the refractive index of the first adhesive layer and the refractive index of the first light transmissive material may be less than or equal to 0.2. The optical sheet 430 can correspond to one of the optical sheets described above. The light loss of the optical sheet 430 can be prevented and the illuminance of the optical sheet 430 can be improved. Therefore, the display quality of the backlight unit 400 can be improved. The diffusion sheet 432 and/or the tantalum sheet 431 can be disposed between the diffusion sheet - 21 - 1380088 480 and the optical sheet 43 0. The diffuser plate 680 can be disposed between the light source 420 and the optical sheet 430 and can diffuse optically from the light source 420 in an upward manner. Since the diffuser 480 is on the light source 420, the light source 420 may not be visible from the top of the backlight unit 400, and the diffuser 480 may further diffuse optically from the light source 420. Figure 4C shows a backlight unit in accordance with an illustrative embodiment of the present invention. Other specific embodiments and architectures are also within the scope of the invention. φ, as shown in FIG. 4C, except that the optical sheet 430 includes the second diffusion layer 250 and the second adhesive layer 240 in addition to the first diffusion layer 220 and the first adhesive layer 230, the backlight Unit 400 can be substantially identical to backlight unit 400 shown in Figures 4A and 4B. Therefore, further explanation of the backlight unit 400 can be omitted. 5A and 5B are exploded perspective and cross-sectional views showing the structure of a liquid crystal display according to an exemplary embodiment of the present invention. Other specific embodiments and architectures are also within the scope of the invention.

The liquid crystal display 500 shown in Figures 5A and 5B may include the backlight units shown in Figures 3A and 3B. For example, the liquid crystal display 500 can include a backlight unit 510 similar to the backlight unit shown in Figures 4A and 4B. Since the backlight unit 510 shown in Figs. 5A and 5B has been described with reference to the above-described 3A and 3B drawings, further explanation thereof may be simplified or may be omitted entirely. As shown in Figs. 5A and 5B, the liquid crystal display 500 can display an image using the photoelectric characteristics of the liquid crystal. -22- 1380088 The liquid crystal display 500 can include the backlight unit 510 and the liquid crystal display panel 610. The backlight unit 510 can be disposed under the liquid crystal display panel 610, and can provide light to the liquid crystal display panel 610. The backlight unit 510 can include a light source 520 and an optical sheet 530. Light from the light source 520 can be reflected from the light source housing 522. The backlight unit 510 can further include a light guide 540, a reflector 550 (or a reflector), a bottom cover 560, and a mold frame 570.

A diffusion sheet 5 32 and/or a ruthenium sheet 531 may be disposed between the light guide 540 and the optical sheet 530. The bottom cover 560 can include a bottom portion 562 and a side portion 5 64 extending from the bottom portion 5 62 to form a receiving space. The liquid crystal display panel 610 can be disposed on the mold frame 570. The liquid crystal display panel 610 can be fixed by a top cover 620 which is fixed to the bottom cover 560 with the top end facing downward. The liquid crystal display panel 610 can display an image using light supplied from the light source 520 of the backlight unit 510. The liquid crystal display panel 610 may include a color filter substrate 612 and a thin film transistor substrate 614 that face each other with liquid crystal interposed between the color filter substrate 612 and the thin film transistor substrate 161. The color filter substrate 612 can realize a color image displayed on the liquid crystal display panel 610. The color filter substrate 612 can include a thin film color filter array formed on a substrate made of a transparent material such as glass or plastic. For example, the color filter substrate 612 can include red, green, and blue color filters -23-1380088. An upper polarizing plate may be disposed on the color filter substrate 612. The thin film transistor substrate 614 can be electrically connected to the printed circuit board 518 through a driving film 516 on which a plurality of circuit portions are mounted. The thin film transistor substrate 614 can apply a driving voltage supplied from the printed circuit board 518 to the liquid crystal in response to a driving signal supplied from the printed circuit board 518.

The thin film transistor substrate 614 may comprise a thin film transistor and a pixel electrode on another substrate made of a transparent material such as glass or plastic. A lower polarizer can be disposed under the thin film transistor substrate 614. Fig. 5C is a view showing a liquid crystal display according to an exemplary embodiment of the present invention. Other specific embodiments and architectures are also within the scope of the invention. As shown in FIG. 5C, in addition to the optical sheet 530 including the second diffusion layer 250 and the second adhesive layer 240 in addition to the first diffusion layer 220 and the first adhesive layer 230, the liquid crystal display 500 The liquid crystal display 500 can be substantially identical to that shown in Figures 5A and 5B. Therefore, further explanation of the liquid crystal display 500 will be omitted. According to the exemplified embodiments, the optical sheet, the backlight unit including the optical sheet, the germanium, and the liquid crystal display including the backlight unit may be composed of a plurality of first diffusion particles (or beads) included in the first diffusion layer. , diffusing light from the source and improving illuminance uniformity. According to the exemplified embodiments, the optical sheet, the backlight unit ' including the optical sheet, and the liquid crystal display including the backlight unit can improve illumination uniformity by further including a second diffusion layer under the reflective polarizing film. -24- 1380088, in accordance with the exemplified embodiments, the optical sheet, the backlight unit including the optical sheet, and the liquid crystal display including the backlight unit, by adjusting a refractive index of the light transmissive material forming the diffusion layer and The refractive index of the adhesive layer prevents light loss of the optical sheet and improves illumination. According to the exemplified embodiments, the optical sheet, the backlight unit including the optical sheet, and the liquid crystal display including the backlight unit are formed by bending, unevenness or non-form between the reflective polarizing film and the diffusion layer. The adhesion layer of the uniform surface allows optical diffusion and improves the illumination uniformity. Exemplary embodiments of the present invention can provide an optical sheet, a backlight unit including the optical sheet, and a liquid crystal display including the backlight unit capable of improving optical diffusion efficiency. The optical sheet may include a reflective polarizing film, a first adhesive layer on a surface of the reflective polarizing film, and a first diffusion layer (or unit) on the first adhesive layer. The first diffusion layer can include a first light transmissive material and a plurality of first diffusion particles. The difference between the refractive index of the first adhesive layer and the refractive index of the first light-transmitting material may be less than or equal to 0.2. The backlight unit can include a light source and an optical sheet on the light source. The optical sheet may include a reflective polarizing film, a first adhesive layer on one surface of the reflective polarizing film, and a first diffusion layer (or unit) on the first adhesive layer. The first diffusion layer may include a first light transmissive material and a plurality of first diffusion particles. The difference between the refractive index of the first adhesive layer and the refractive index of the first light transmissive material may be less than or equal to 0.2. The first adhesive layer may have a first thickness and a second thickness, and the first thickness T1 and the second -25-1380088 thickness T2 substantially satisfy the following equation: l〇nmS |Τ1-Τ2|52μιη. The liquid crystal display can include a light source, an optical sheet on the light source, and a liquid crystal panel on the optical sheet. The optical sheet may include a reflective polarizing film, a first adhesive layer on one surface of the reflective polarizing film, and a first diffusion layer (or unit) on the first adhesive layer. The first diffusion layer can include a first light transmissive material and a plurality of first diffusion particles. The difference between the refractive index of the first adhesive layer and the refractive index of the first light transmissive material may be less than or equal to 0.2. The first adhesive layer may have a first thickness and a second thickness, and the first thickness Τ1 and the second thickness Τ2 substantially satisfy the following equation: 10ηιη£|Τ1-Τ2|$2μιη. "an embodiment,", "an embodiment,", "exemplary embodiment", etc., as used in this specification, means that the particular features, structures, or characteristics described with respect to the specific embodiments are included in the invention. In one embodiment. The wording of the various aspects in the specification is not necessarily referring to the same embodiment. In addition, when the specific features, structures, or characteristics are described in any particular embodiment, it is intended that the influence of such features, structures, or characteristics in other embodiments is still familiar in the art. Within the scope of the person. Although the embodiments have been described with reference to a number of exemplary embodiments, it is understood that many other modifications or embodiments can be inferred by those skilled in the art, which still fall within the spirit and scope of the disclosed principles Inside. More particularly, various modifications and adaptations are possible in the component parts and/or arrangements of the subject combination arrangement in the scope of the disclosure, the drawings and the accompanying claims. Alternative uses will be readily apparent to those skilled in the art, in addition to variations in the components and/or configurations -26- 1380088 and modifications. BRIEF DESCRIPTION OF THE DRAWINGS The configuration and specific embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein the same reference numerals refer to the same elements, and wherein: FIG. 1 is a cross-sectional view of an optical sheet in accordance with an exemplary embodiment of the present invention. 2 is a cross-sectional view of an optical sheet in accordance with an exemplary embodiment of the present invention: FIGS. 3A and 3B show a backlight unit in accordance with an exemplary embodiment of the present invention; and FIG. 3C shows an exemplary implementation in accordance with the present invention; Example of a backlight unit; FIGS. 4A and 4B are diagrams showing a backlight unit according to an exemplary embodiment of the present invention; FIG. 4C is a diagram showing a backlight unit according to an exemplary embodiment of the present invention; FIGS. 5A and 5B are diagrams showing A liquid crystal display according to an exemplary embodiment of the present invention: and a fifth liquid crystal display according to an exemplary embodiment of the present invention. [Description of main component symbols] 100, 200, 330, 430, 530 Optical sheet 110, 210 Reflective polarizing film 111 '211 First layer -27- 1380088 112 '212 Second layer 120, 220 First diffusion layer 121 '221 a luminescent material 122' 222 first diffusion particles 130, 230 first bonding layer 131a, 231a first surface 131b, 231b second surface T1 first thickness T2 second thickness 240 second bonding layer 241a third surface 241b fourth surface 250 second diffusion layer T3 third thickness T4 fourth thickness 251 second luminescent material 252 second diffusion particles 300, 400, 510 backlight unit 320 ' 420 ' 520 light source -28 - 1380088 322 ' 522 light source housing 331 ' 431 ' 531稜鏡 332 ' 432 ' 532 diffusion sheet 340 ' 540 light guide 350 , 450 , 550 reflector 360 , 460 , 560 bottom cover 362 ' 562 bottom 364 , 564 side 370 ' 470 ' 570 480 480 diffuser 500 LCD Display 516 drive film 518 printed circuit board 610 liquid crystal display panel 612 color filter substrate 614 thin film transistor substrate 620 top cover -29-

Claims (1)

T380088 Revised Patent No. 097 1 448W "Optical Sheet, Backlight Unit and Liquid Crystal Display" (Amended on July 23, 2012) X. Patent Application Range: 1 optical sheet, including: reflective polarizing film; first adhesive layer On the surface of one of the reflective polarizing films; and the first diffusion layer 'on the first adhesive layer, the first diffusion layer includes a first light transmissive material and a plurality of first diffusion particles, φ The difference between the refractive index of the adhesive layer and the refractive index of the first light transmissive material is less than or equal to 0.2, wherein the first adhesive layer comprises a first surface and a second surface facing the first diffusion layer, wherein the The first surface is completely attached to the first diffusion layer, wherein T1 represents a first thickness between the first surface and the second surface, and T2 represents a second thickness between the first surface and the second surface, and T1 and T2 generally satisfy the following equation: 10nm$ | T1-T2 | £2μιη 〇# 2. The optical sheet of claim 1, further comprising: a second diffusion layer on the reflective polarizing film On the other surface. 3. The optical sheet of claim 2, further comprising: a second adhesive layer between the reflective polarizing film and the second diffusion layer, the second adhesive layer comprising a third surface and a fourth surface, Wherein Τ3 represents a third thickness between the third surface and the fourth surface, Τ4 represents a fourth thickness between the third surface and the fourth surface, and wherein Τ3 and Τ4 substantially satisfy the following equation: 1380088 Ben 10nmS I T3-T4 I 52μηι. 4. The optical sheet of claim 3, wherein the second average thickness is about Ιμπι to ΙΟμιη. 5. The optical sheet of claim 2, wherein the first or second adhesive layer is made of a group selected from the group consisting of an acrylic adhesive, a rubber agent, an enamel adhesive, and a combination thereof. to make. 6. The optical sheet of claim 2, wherein the second comprises a second light transmissive material and a plurality of second diffusing particles. 7. The optical sheet of claim 6 wherein one of the first particles has a diameter of from about 0.5 μm to about ιμηη. 8. The optical sheet of claim 6, wherein each of the extensions is a bead. 9. The optical sheet of claim 6, wherein each of the first particles or the second diffusion particles is selected from the group consisting of polymethyl benzoate, polystyrene, hydrazine, and combinations thereof. The materials of the group are formed. 10. The optical sheet of claim 1, wherein the first average thickness is about Ιμηη to ΙΟμιη. 11. The optical sheet of claim 1, wherein one of the first particles has a diameter of about 0.5 μm to ΙΟμηι. 12. The optical sheet of claim 1, wherein the first comprises a plurality of bubbles. 13. The optical sheet of claim 1, wherein the reflective adhesive layer is adhered to the adhesive layer, the diffusion layer is dispersed, the diffused particles are diffused, the acrylic layer is formed, the adhesive layer is diffused, and the diffusion layer is polarized. 1380088 The thickness of this film is corrected to be approximately ιμιη to 300μηι. 14. The optical sheet of claim 1, wherein the reflective film comprises a first layer and a second layer, and wherein the first layer has the same refractive index as the second layer. 15. A backlight unit comprising: a light source; and an optical sheet receiving light from the light source, the optical thin j reflecting a polarizing film; a first adhesive layer, a first diffusion layer on a surface of the reflective polarizing film, On the first adhesive layer, the first expanded first light transmissive material and the plurality of first diffused particles, wherein a difference between a refractive index of the first adhesive layer and the first light transmissive refractive index is less than or equal to 2, wherein the first adhesive layer includes a second surface facing the first diffusion layer, wherein the first surface is completely attached to the layer, wherein T1 represents an interval between the first surface and the second surface T2 indicates that the first and the second surface between the first surface and T1 and T2 substantially satisfy the following 10 nmS | T1-T2 | 52μηι. The backlight unit of claim 15, wherein the light comprises: a second diffusion layer, a second adhesive layer on the other surface of the reflective polarizing film, and the reflective polarizing film and the second space, The second adhesive layer includes a third surface and a fourth surface, and the refractive index of the polarized light is not reduced: and the first layer of the first surface of the first layer of the diffusing material includes a first thickness and a thickness of the first diffusion. And the diffusion layer -3- 1380088, wherein T3 represents a third thickness between the third surface and the fourth surface, Τ4 represents a fourth thickness between the third surface and the fourth surface, and wherein Τ3 The following equation is generally satisfied with Τ4: 10nmS | Τ3-Τ4 | £2μηι. 17. A liquid crystal display comprising: a light source; an optical sheet receiving light emitted from the light source, the optical sheet comprising: a reflective polarizing film; a first adhesive layer 'on one surface of the reflective polarizing film; a diffusion layer on the first adhesive layer, the first diffusion layer comprising a first light transmissive material and a plurality of first diffusion particles, and a liquid crystal panel on the optical sheet, wherein the first adhesion layer is refracted The difference between the rate and the refractive index of the first light transmissive material is less than or equal to 0. 2, wherein the first adhesive layer comprises a first surface and a second surface facing the first diffusion layer, wherein the first The surface is completely attached to the first diffusion layer, wherein Τ1 represents a first thickness between the first surface and the second surface, Τ2 represents a second thickness between the first surface and the second surface, and Τ1 and Τ2 generally satisfies the following equation: 10ηηι5|Τ1-Τ2|£2μηι. The liquid crystal display of claim 17, wherein the optical sheet further comprises: a second diffusion layer on the other surface of the reflective polarizing film; and -4- 1380088 to modify the second adhesive layer, Between the reflective polarizing film and the second diffusion layer, the second adhesive layer includes a third surface 舆 a fourth surface, wherein T3 represents a third thickness 'T4' between the third surface and the fourth surface a fourth thickness between the third surface and the fourth surface, and wherein T3 and T4 substantially satisfy the following equation: lOnmS | T3-T4 | $2μπι 〇 19. An optical sheet comprising: a reflective polarizing film; a layer 'on one surface of the reflective polarizing film; and a first diffusion layer' on the first adhesive layer, the first diffusion layer comprising a first light transmissive material and a plurality of bubbles, wherein the first adhesive layer The difference between the refractive index and the refractive index of the first light transmissive material is less than or equal to 0.2, wherein the first adhesive layer includes a first surface and a second surface facing the first diffusion layer, wherein the first The face is completely attached to the first diffusion layer, wherein Τ1 represents a first thickness between the first surface and the second surface, Τ2 represents a second thickness between the first surface and the second surface, and Τ1 and Τ2 generally satisfies the following equation: l〇nm$ | Τ1-Τ2 | £2μηι. 20. The optical sheet of claim 19, further comprising: a second diffusion layer on the other surface of the reflective polarizing film; and a second adhesive layer on the reflective polarizing film and the second diffusion layer The second adhesive layer includes a third surface and a fourth surface, wherein Τ3 represents a third thickness between the third surface and the fourth surface 5-1380088 Modified, T4 represents the fourth thickness between the third surface and the fourth surface, and wherein Τ3 and Τ4 substantially satisfy the following equation: 10nmS 丨 Τ3-Τ4 丨 52μηι 〇 -6-