TW200532312A - Backlight module and prism sheet - Google Patents

Abstract

The present invention relates to a prism sheet and a backlight module using this prism sheet. The backlight module includes a light source, a reflective sheet, a light guide plate, a diffuse sheet and a prism sheet. The light source is disposed adjacent to the light guide plate. The reflective, the light guide plate, the diffusion sheet and the prism plate are stacked in order. The diffusion sheet includes a incidence surface for receiving light beams and an emitting surface opposite to the incidence surface. The emitting surface includes a matrix of micro-lenses.

Description

200532312 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a borrowing group, and particularly to a backlight module of a J-sheet and a light-emitting sheet. ; Crystal display is not the light condensing sheet and the use of the condensing [prior art] t light sheet is the former jy 4 τ4 · > light sheet 15 and the light source u == important components' as shown in the first figure, the light is concentrated into a backlight mode Group 1 m # light guide plate 13 and diffuser sheet 14 combine to make the LCD panel _ dry \ fruit \ luminous LCD panel to provide lighting 'Condensing sheet 15 main package; :: ^^ Light sheet 15 is a light concentrating device, The entrance surface and a light exit surface have the function of refracting the light after the moon is expanded, and the light is scattered to a liquid crystal panel within a certain angle range, thereby improving the brightness of the illumination. For a light condensing sheet of the prior art, please refer to Chinese Mainland Patent No. 0 1 2 0 0 5 5 1 announced on JJ 28, 2000. As shown in the second figure, the light condensing sheet 25 includes a base Sheet 2 5 2 and a fine semi-spherical layer 2 5 1. Wherein, the fine semi-spherical layer 2 5 1 is made of epoxy material, and when the mold of the fine semi-spherical layer 2 5 1 is formed without curing, the upper surface of the substrate 2 5 2 is adhered to the fine ° The bottom surface of the semi-spherical layer 2 5 1 forms a light-condensing sheet 2 5. Therefore, the upper surface of the fine hemispherical layer 251 and the bottom surface of the substrate 252 together form the upper surface 255 and the bottom surface 254 of the light condensing sheet 25. The upper surface 255 of the light condensing sheet 25 has a coarse green characteristic and the bottom surface 2 5 4 has Smooth properties. The fine semi-spherical layer 2 5 1 is composed of fine semi-spherical spheres 2 5 3 arranged in a semi-spherical shape. When the light passes through the bottom surface 2 5 4 of the light condensing sheet 25 and enters the light condensing sheet 25 and passes through the fine hemispherical layer 2 5 1, the light is arced by the fine hemisphere 2 5 3

Page 5 200532312 V. Description of the invention (2) The surface is refracted and focused so that the light on the upper surface 2 5 5 of the condensing sheet 25 has a better brightness. However, the light enters the substrate 2 5 2 and the fine hemispherical layer 2 5 1 through the bottom surface 2 5 4 of the light-concentrating sheet 25. During the process of exiting from the upper surface 2 5 5 due to the two sides of the substrate 2 5 2 The different optical media are the substrate 2 5 2 and the fine semi-spherical layer 2 5 1 respectively, causing a part of the light to reflect from the substrate 2 5 2 into the fine semi-spherical layer 2 5 1, causing light energy loss and reducing the use of light energy. rate. In addition, the light-condensing sheet 25 is formed by adhering the upper surface of the substrate 2 5 2 to the bottom surface of the fine hemispherical layer 2 51, and the manufacturing process is complicated. In view of this, it is necessary to provide a light-condensing sheet with a simple process and a high light energy utilization rate. SUMMARY OF THE INVENTION The object of the present invention is to provide a light condensing sheet with a simple process and a high light energy utilization rate. Another object of the present invention is to provide a backlight module using the above-mentioned light-condensing sheet. The light-condensing sheet of the present invention includes at least one light-entering surface for receiving light, and a light-exiting surface opposite to the light-entering surface, wherein the light-exiting surface has a microlens array 歹 | J. The backlight module of the present invention includes a light source, a reflection sheet, a light guide plate, a diffusion sheet, and a light collection sheet, wherein the light source is placed on one side of the light guide plate, the reflection sheet, light guide plate, diffusion sheet, and light collection The sheets are placed in order. The light-condensing sheet includes a light-entering surface for receiving light and a light-exiting surface opposite to the light-entering surface, wherein the light-exiting surface has a microlens array.

200532312 V. Description of the invention [3] ---- Compared with the prior art, because the light-condensing sheet of the present invention can be directly manufactured on the device for manufacturing the light guide plate, the micro-lens array that puts the light-condensing sheet on the light surface is directly controlled by On the mold core of the condensing sheet mold, it is pressed and ejected together with the condensing sheet through injection molding, and its manufacturing process is simplified. In addition, the micro-lens array and the light-condensing sheet have an integrated structure, and the light source emits light into the light-condensing sheet. When passing through the micro-lens array, no reflection occurs and light energy loss is reduced, thereby improving the light energy utilization rate of the backlight module. . [Embodiment] Please refer to the third figure, which is a three-dimensional schematic diagram of the light-condensing sheet of the present invention. The light-concentrating sheet 35 includes a light-receiving surface 3 54 for receiving light, and a light-receiving surface of the light-condensing sheet. 354 is the opposite light-condensing sheet light-emitting surface 355, wherein the light-condensing sheet light-emitting surface 3 5 5 has a micro-lens array 3 5 1, and the micro-lens array 3 5 1 is composed of a plurality of hemispherical bumps 3 5 3 of the same size. . Please read the fourth picture together. The light enters the light condensing sheet 35 through the light incident surface 3 5 4 of the light condensing sheet. When the light passes through the micro lens array gw, the light is refracted by the arc surface of the hemispherical bump 3 5 3 Condensing light is finally emitted from the light-emitting surface 3 5 5 of the condensing sheet. The micro lens array 3 51 can change the transmission direction of the light, deflect the light incident obliquely to the vertical direction, and concentrate the light incident perpendicularly to a certain angle range, thereby increasing the brightness of the illumination. The micro lens array 35 and the water light sheet 35 are an integrated structure, and the light emitted by the light source enters the light condensing sheet 35. When passing through the micro lens array 3 5 i, no reflection is generated and the light energy loss is reduced. Improve the light energy utilization of the backlight module. The material of the light-concentrating sheet 35 is an organic resin having a higher refractive index, better transparency, and light transmittance, such as a polyester (p 〇 1 y e s t e r), polycarbonate

200532312 V. Description of the invention (4) (Polycarbonate, PC) and polymethyl methacrylate (PMMA), etc. The condensing sheet 35 can be directly manufactured on a device for manufacturing a light guide plate, and the mold core for manufacturing the condensing sheet 35 is directly processed by using electron beam or laser, or the electron beam is lithographically printed on the condensing sheet mold. A micro-lens array structure is formed on the mold core and is extruded together with the light-concentrating sheet 3 5 through injection molding. It can be seen that the same process as that of the light guide plate can be used in the manufacturing process of the light-condensing sheet 35, and the manufacturing process is simple. ^ Please refer to the fifth figure, which is a schematic plan view of a backlight module of the present invention. The backlight module 5 includes a light source 51, a reflective sheet 52, a light guide plate 53, a diffuser sheet 54 and a condensing sheet 35. The light source 51 is placed on the light-incident surface 534 of the light guide plate. The reflection sheet 52, the light guide plate 53, the diffusion sheet 54 and the light collecting sheet 35 are sequentially placed. The light emitted by the light source 51 enters the light guide plate 53 through the light guide plate light entrance surface 534, and a part of the light is directly emitted through the light guide plate light exit surface 535, and a part of the light is repeatedly reflected by the reflection sheet 52 and is also emitted through the light guide plate light exit surface 535. The light guide plate 5 The light emitted by 3 is diffused by the diffusion sheet 5 4 and enters the light-receiving surface of the light-condensing sheet 3 5 4 and enters the light sheet 35. The light passes through the micro-lens array 351 of the light-emitting surface 355 of the light-condensing sheet. The arc surface of the bump 3 5 3 is refracted and focused, and is finally emitted from the light-emitting surface 3 5 5 of the light collecting sheet. Since the micro lens array 3 51 can change the transmission direction of the light, the light incident at an oblique direction is deflected toward the vertical direction, and the light incident at a right angle is concentrated within a certain range of angles, thereby improving the brightness of the illumination. The light source 51 may be a cold-cathode fluorescent tube, a dot-shaped light emitting diode, or the like, such as a linear, l-shaped, U-shaped, or other shape.

200532312 V. Description of the invention (5) In summary, the present invention has indeed met the requirements for an invention patent, and a patent application was filed in accordance with the law. However, the above are only the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above embodiments. For those who are familiar with the technology of this case, equivalent modifications or changes made in accordance with the spirit of the present invention are all It should be covered by the following patent applications.

200532312

Page 10 Brief Description of the Drawings The first drawing is a plan view of the prior art backlight module. The second picture is a plan view of the prior art condenser. The second figure is a three-dimensional schematic view of the light-condensing sheet of the present invention. The fourth figure is a partially enlarged light of the light-condensing sheet shown in the second figure > Road schematic diagram The fifth figure is a plan view of the backlight module of the present invention. [Description of main component symbols] Condensing sheet 35 Micro lens array 351 Hemispherical bumps 353 Condensing sheet light-entering surface 354 Condensing sheet light-emitting surface 355 Backlight module 5 Light source 51 Reflecting sheet. 52 Light guide plate 53 Light guide plate light-entry surface 534 Light guide plate light exit surface 535 Diffusion sheet 54

Claims (1)

200532312 VI. Scope of patent application 1. A light-condensing sheet comprising: a light-incident surface and a light-exit surface opposite to each other, wherein the light-exit surface has a microlens array. 2. The light-condensing sheet according to item 1 of the patent application, wherein the micro-lens array is composed of a plurality of hemispherical bumps of the same size. 3. The light-condensing sheet according to item 1 of the scope of patent application, wherein the micro-lens array and the light-condensing sheet are an integrated structure. 4. The light-condensing sheet according to item 1 of the scope of patent application, wherein the material of the light-condensing sheet is a polyester. 5. The light-condensing sheet according to item 1 of the scope of patent application, wherein the material of the light-condensing sheet is polycarbonate. 6. The light-condensing sheet according to item 1 of the scope of patent application, wherein the material of the light-condensing sheet is polymethyl methacrylate. 7. A backlight module comprising: a light source, a reflection sheet, a light guide plate, a diffusion sheet and a light collection sheet, wherein the light source is placed on one side of the light guide plate, the reflection sheet, light guide plate, and diffusion The sheet and the light-condensing sheet are sequentially placed, and the light-condensing sheet includes a light-incident surface and a light-exiting surface opposite to each other, wherein the light-exiting surface has a microlens array. 8. The backlight module according to item 7 of the scope of patent application, wherein the light source is a cold cathode fluorescent lamp. 9. The backlight module according to item 7 of the scope of patent application, wherein the light source is a light emitting diode. 10. The backlight module according to item 7 of the scope of patent application, wherein the micro-transparent 200532312 6. Scope of patent application · The mirror array is composed of a plurality of hemispherical bumps of the same size. '1 1. The backlight module according to item 7 of the scope of patent application, wherein the micro-mirror array and the light-condensing sheet are an integrated structure. 1 2. The backlight module according to item 7 of the scope of patent application, wherein the material of the light-concentrating sheet is a multi-purpose S purpose. 1 3. The backlight module according to item 7 of the scope of patent application, wherein the material of the light-concentrating sheet is polycarbonate S. 1 4. The backlight module according to item 7 of the scope of patent application, wherein the material of the light-condensing sheet is polymethyl methacrylate. Page 12