TW200422670A - Light guide plate and surface light source device - Google Patents

Abstract

The present invention provides a light guide plate, which includes an incident surface for receiving light coming from a light source, a light emitting surface adjacent to the incident surface and a bottom surface being opposite to the light emitting surface. The bottom surface includes at least an oblique surface and a surface adjacent to the oblique surface and parallel to the light emitting surface. A surface light source device including the light guide plate is also provided.

Description

Prior art surface light source devices such as the first m Π) 200422670 V. Description of the invention (0 [Technical field to which the invention belongs] The present invention relates to a light guide plate and the use of the guide, especially to a low-cost, center-glow surface Light source device. [Previous technology] Liquid crystal displays are mainly used in various types of information and communication, such as personal computers, LCD TVs, mobile phones, etc. The LCD panel itself does not have light-emitting characteristics, and the plane light of intermediate brightness is used to obtain the results. 12: Light guide plate 1, located on the light guide plate! Bottom surface η-surface = diffuser plate 3 on one side of the light exit surface 12 of the first plate 1, one: the light source 6 and the light source cover 7 and the diffuser-"η reverse 4, 5 When working, the second light guide plate f is diverged to produce a more uniform product. Second, the light emitted from the self-diffusion plate 3 can be used to improve the brightness of the liquid crystal display. However, the door car ^ evening, Not only increases the surface light source device 10 =; ::: lipid glue, the light beam passes through the glue layer to lower the brightness before emission, and then the cymbals 4 and 5 are expensive and the cost of the human device 10 is higher. , And and the way is more complex 2〇 Announced on May 10, 2001, China ’s large light panel has a high level of surface light source and light guide plates and information, consumer product video phones, pda 'requires a good visual effect of the surface light source device', the reflective plate of the surface light source device 2, located in the guide The light plate 1 enters the light 3—the side two vertical light beams pass through the light, and the light surface light source device 10 emitted by the light beam S is moderate, and the brightness of the energy loss device will be generated because of this element. In addition, ' Therefore, the surface light source type patent No. 200422670 V. Description of the invention (2) CN9 9 2 1 4 2 1 No. 1 discloses a surface light source device in which a plurality of ladder-shaped printing lines are arranged on the light exit surface of a light guide plate, such as the second As shown in the figure, the surface light source device 20 includes a light guide plate 21, a reflection plate 22, a light source 24, and a light diffusion film 23, wherein a plurality of ladder-shaped printing lines 2 6 1 are provided on the light exit surface 26 of the light guide plate 21, and The light collecting function can be generated on the V-light plate 21, thereby improving the brightness of the entire surface light source device 20. However, the printing type is a shame, because the light can only be collected in one direction along the printing direction, the utilization rate of the light is low, 7 the brightness of the device. Mainland China Utility Model No. 20m6, announced on November 24, 1999, discloses a light guide plate whose light exit surface is provided with a patent No. 1 to improve the brightness of the surface light source device, in order to enhance the surface light: , Single-axis brightness, can also be set on the light exit surface of the biaxial 稜鏡. 置, = the device panel usually requires a higher center brightness to match the observer ~, night crystal display can not match the mouth called Pei A rp However, the degree of heart failure is still called 绊 ^, and the brightness of the light emitted by the light guide plate is more necessary. Those who want to go to Shenh In view of this, provide a fortune bar, It is necessary to observe the light guide plate and surface light source device with low cost and high center brightness [Content of the invention] One object of the present invention is to provide a one-eight-eighth 々0 々 mile to a south 南 4. One purpose is to enshrine Guangguang. Surface light source device. ％% 乂 centerless brightness is high The light guide plate of the present invention includes at least one-Mingu X 4 τ, for receiving the incident light plane adjacent to the light incident plane 之 ψ & ~ W out of the light 丨 light exit A surface and a bottom surface with the light exit nine, wherein the < bottom surface includes at least one inclined surface and a surface connected to the inclined surface 200422670 V. Description of the invention (3) and a surface parallel to the light exit surface. The surface light source device of the present invention includes a light guide plate having at least one light incident surface for receiving incident light and at least one light source disposed on a side corresponding to the light incident surface. The light guide plate further includes an adjacent light incident surface. A light emitting surface and a bottom surface opposite to the light emitting surface, wherein the bottom surface includes at least one inclined surface and a surface connected to the inclined surface and parallel to the light emitting surface. A V-shaped groove array is further provided on the light exit surface of the light guide plate in the surface light source device. Compared with the prior art, the effect of the present invention is that since the bottom surface includes at least one inclined surface and a surface connected to the inclined surface and parallel to the light exit surface I, that is, the bottom surface is trapezoidal, the light incident on the light guide plate is mainly Concentrated in the central area, so the brightness is higher in the central area, which can meet the viewing needs of the observer. In addition, a V-shaped groove array is provided on the light exit surface of the light guide plate, which can omit the adhesive process of the cymbals and the cymbals and the light guide plate, which can not only reduce components, simplify the manufacturing process, and avoid light energy loss caused by light passing through the adhesive layer. Therefore, the surface light source device having the light guide plate has the effects of low cost and high center luminance. [Embodiment] Please refer to the third figure. The light guide plate 30 used in the first embodiment of the present invention includes two light incident surfaces 31 for receiving incident light, and guides light out and intersects the light incident surface 31. The surface 32 and the bottom surface 33 opposite to the light exit surface 32. The light guide plate 30 is a double wedge, and the light exit surface 32 is V-shaped, that is, the light exit surface 32 has inclined surfaces 321 and 322 at a certain angle to the bottom surface 33. I: Therefore, the light incident on the light guide plate 80 Will reflect towards the center area, so the center

200422670

V. Description of the invention (4) The area has a high luminance, which meets the observer's requirements. Two rules, the shooting point array 3 3 1, each scattering point can be, but not. The bottom surface 3 3 is provided with a scattered shape, a spherical shape, a cylindrical shape, a cube, or a ^^^ micro-shape, a point shape, and a square shape. The shape can be injection-molded through the light guide plate to form a tower shape. The scattering points are arrayed. " ", out 'can also be printed by printing. Please read the fourth circle. The bottom surface 43 of the third figure is V-shaped. Therefore, the 4 ° incident to the light guide plate is the reflection of the light guide plate 40, so the center The light with higher brightness in the area will go to the center area. Please refer to the fifth figure, which does not meet the visual requirements of the observer. The light exit surface 52 is provided with a V-shaped groove array 521, 5 because the light guide plate 50 has a higher luminance. The V-shaped groove array 5 2 1 is arranged on the light guide plate 50 of 52 in phase two j series, that is, each -v opening / degree of the V-shaped groove array 521 is set to the same light exit surface, and adjacent v The angles, degrees, and visibility between the grooves can also be distributed on the light exit surface 52 with different densities. . Each V-shaped groove array 521 also has each V-shaped angle, depth, and width passed through the ¥ -shaped groove array to increase. The V-shaped groove array 521 can be oriented in the direction of the light surface 51 with an optimized angle of 80 ° to 100 °. The V-shaped groove array is up to 110 once, which is up to iOO / im, where the optimized slot height is 40㈣ to 6 (), the slot direction is 20_ 521, and the slot width is 50 " "^ 2 0 0, of which 〇 each _. The ^ slot array is 125 cores. * The v-shaped slot can also be trapezoidal, V? Degree is 75, and the slot array 521 can be integrated with the light guide plate 50 to shoot other shapes, such as engraving. , Laser direct writing method, precision machinery: = 'can also be manufactured by the chemical method. See also the sixth sincerity, and the fifth figure is the light guide plate 6〇 200422670 V. Description of the invention (5) The bottom surface 63 is V-shaped. Therefore, the light incident on the light guide plate 60 will be reflected toward the central area, so the central area has a higher brightness to meet the visual requirements of the observer, and the light exit surface 6 A V-shaped groove array 6 2 1 is provided on 2 so that the light guide plate 60 can enhance the light intensity. Please refer to FIG. 7, which is a schematic diagram of the fifth embodiment of the light guide plate of the present invention. The light guide plate 70 includes two for receiving incident light. Light incident surface 71, light exit surface 72 that guides light out and intersects the light incident surface 71, and a bottom surface 7 opposite to the light exit surface 72 3. The light exit surface 72 of the light guide plate 70 is trapezoidal, and includes two inclined surfaces 721 and 722 and a surface 723. The two inclined surfaces 721 and 722 are disposed at an angle with respect to the bottom surface 73, and the surface 723 and the bottom surface 73 is arranged in parallel. The trapezoidal design of the light exit surface 72 allows the light incident on the light guide plate 70 to be reflected toward its central area, so the central area has a higher brightness to meet the visual needs of the observer. The bottom surface 73 can be arranged with the third The bottom surface 3 3 of the light guide plate 30 is the same as the scattering dot matrix 7 3 1. Please refer to the eighth figure, which is different from the seventh figure in that the bottom surface 83 of the light guide plate 80 is trapezoidal, and the bottom surface 83 includes a light exit The surface 82 has two inclined surfaces 831 and 832 arranged at a certain angle and a surface 8 3 3 arranged parallel to the light exit surface 82. Please refer to the ninth figure, which is different from the seventh figure in the light exit of the light guide plate 90 A V-shaped groove array 9 2 1 is arranged on the surface 9 2, the purpose is to make the light guide plate 90 more bright. The V-shaped groove array 9 2 1 is arranged on the light emitting surface 92 with the same density, that is, the V shape. The angle, depth, and width of each V-shape in the slot array 9 2 1 are the same, and The distance between adjacent V-shaped grooves is also the same. The V-shaped groove array 9 2 1 can also be distributed on the light exit surface 9 2 with different densities, wherein the V-shaped groove array

200422670

The angle, depth, and direction of each V-shape of 921 increase.竽 V 拟 M 播 ^ Q91 The visibility is along the square gate V-shaped groove array 9 2 1 far away from the light-entering surface 91. The optimized angle sound is Αβηώ: The small angle is 70 degrees to 110 degrees. C monthly is 80 degrees to 100 degrees. The V is again 1 0 0 // m, and the slot height of the array 9 2 1 is 2 0 // m to iuu // m, where the optimized slot height is 4 921. ^ η ηηη To b0am. The monks of the V-groove array are seen from 50 am to 200 / zm, among which 19 卩 " 111 is excellent. The branching visibility of Gan 11 is 75 / ζπι to 1 25 // m. The v-shaped groove can also be trapezoidal, V-shaped, and other shapes of Xibian I Temple. Wu Hai ΛΛ 1 can be injection molded with the light guide plate 90, and can also use chemical surname direct writing method, precision machining method and photolithography method.

In addition, a ¥ -shaped groove array 921 as shown in the ninth figure may be provided on the light-exiting surface 82 of the light guide plate 80 shown in the eighth figure, which can make the light guide plate 80 have a higher brightness.

Referring to the tenth figure, the surface light source device according to the present invention includes a light guide plate 110, a light source 104 located at the light entrance surface of the second light guide plate 110, and a light emitted from the light source 104 outside the light guide plate and reflected into the light guide plate.丨 丨 〇 的 Reflector 1 05. The light source 104 may be a cold cathode fluorescent lamp or an LED. The reflection plate 105 is a semi-closed reflector, which includes a light reflected from the light source 1 q 4 to the light incident surface 1 1 1 and enters the first part 1 107 of the light guide plate 1 10 and a The light is reflected to the bottom surface 1 1 3 and enters the second part of the light guide plate 1 1 0. The reflection plate 105 is opposite to the bottom surface 1 13 and the surface 1 of the light incident surface 1 1 1. Higher reflectivity, which roughly ranges from 90% to 99%. The surface 1061 can be bonded to a metal having a high reflectance, such as silver, aluminum, titanium dioxide, or an oxide thereof, by an ion implantation (Ion Plating) method or a sputtering method.

Page 10 200422670 V. Description of the invention (7) The light guide plate 1 10 is a double wedge shape, which may also be the shape shown in the ninth figure, or other shapes such as a flat plate shape and a wedge shape. A V-shaped groove array 1121 is disposed on the light emitting surface 112. The V-shaped groove array 1121 is arranged on the light exit surface 1 12 with the same density, and can also be set with different densities, that is, the angle, depth and width of each V-shape of the y-shaped groove array 1121 are far from the light-incident surface. ηι's direction. What is the ¥ -shaped angle of the v-groove array 1121? 0 degrees to 110 degrees, wherein the optimized angle is 80 degrees to 100 degrees. The groove height of the v-shaped groove array is 20 / zm to 100 // m, and the optimized groove height is “⑽ to ㈤⑽. The groove width of the v-shaped groove array 1121 is 50 // 1]] to 2〇. 〇 // 111, where the optimized width is 75 " to 125. The groove can also be trapezoidal, polygonal, and other shapes. The v-groove / car train 1121 can be injection-molded with the light guide plate 110, or can be used. Manufactured by engraving method, laser direct writing method, precision machining method, and photolithography method. In addition, the bottom, 113 is provided with a scattering point array 1131, where the size of each scattering point is far from the light incident surface 丨 丨The direction is increasing, the closer it is to the light incident surface 111, the smaller the size and the more sparse it is; the further away from the light incident surface U1, the larger the size and the denser the distribution. The scattering point array For each scattering point, points I, j are prism-shaped, point-shaped, square-shaped, spherical, cylindrical, cube-shaped, or z-shaped. The scattering point array 1 丨 3 丨 can be emitted through the light guide plate 丨 丨It can be formed as a whole and printed by printing. In addition, in order to make the light output from the light exit surface 112 more uniform, the light exit surface 112 can be used. Set a diffusion sheet (not shown) As described above 'disclosure of the present invention meet the requirements of the patent, patent application proposes Yuan law but, above <.. The person merely preferred embodiments of the present invention, that whenever.

200422670

Page 12 200422670 Brief Description of Drawings The first drawing is a schematic plan view of a prior art surface light source device. The second figure is an exploded perspective view of still another prior art surface light source device. The third figure is a perspective view of the first embodiment of the light guide plate of the present invention. The fourth diagram is a schematic plan view of the second embodiment of the light guide plate of the present invention. The fifth diagram is a perspective view of the third embodiment of the light guide plate of the present invention. The sixth diagram is a schematic plan view of the fourth embodiment of the light guide plate of the present invention. The seventh figure is a perspective view of a fifth embodiment of the light guide plate of the present invention. The eighth figure is a schematic plan view of a sixth embodiment of the light guide plate of the present invention. The ninth figure is a perspective view of a seventh embodiment of the light guide plate of the present invention. The tenth figure is a schematic diagram of the surface light source device of the present invention. [Description of component symbols] Light incident surface 31, 51, 71, 111 Light exit surface 32, 5 2, 62, 72, 82, 92, 112 V-groove array 521, 621, 921, 1121 Scattering point array 331, 731, 1131 reflector 105 first part 107 second part 106 surface 1061 surface light source device 100 light source 104 inclined surface 321, 3 22, 721, 722, 831, 832 surface 7 2 3, 833 light guide plate 3 0, 40, 50, 60, 70, 80, 90, 110 Underside 33, 43, 63, 73, 83, 113

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Claims (1)

200422670 VI. Application patent scope 1. A light guide plate, comprising: at least one light incident surface for receiving incident light; a light exit surface adjacent to the light incident surface; and a bottom surface opposite to the light exit surface Wherein, the bottom surface includes at least one inclined surface and a surface connected to the inclined surface and parallel to the light exit surface. 2. The light guide plate according to item 1 of the scope of patent application, wherein the bottom surface is trapezoidal. 3. The light guide plate according to item 1 of the scope of patent application, wherein the light exit surface is provided with a V-shaped groove array. 1 4. The light guide plate according to item 3 of the scope of patent application, wherein the V-groove arrays are distributed at the same density. 5. The light guide plate according to item 3 of the scope of patent application, wherein the V-shaped angle of the V-shaped groove array increases in a direction away from the light incident surface. 6. The light guide plate according to item 3 of the scope of patent application, wherein the groove height of the V-shaped grooves of the V-shaped groove array increases in a direction away from the light incident surface. 7. The light guide plate according to item 3 of the scope of the patent application, wherein the groove width of the V-shaped groove of the V-shaped groove J train increases in a direction away from the light incident surface. 8. The light guide plate according to item 5 of the scope of patent application, wherein the angle of the V-shaped groove is 70 degrees to 110 degrees. 9. The light guide plate according to item 6 of the scope of patent application, wherein the groove height of the V-shaped groove is 20 // IT1 to 100 / zm. 10. The light guide plate according to item 7 of the scope of patent application, wherein the groove width of the V-shaped groove is 50 / zm to 200 // m. Page 14 200422670 6. Scope of patent application 1 1. The light guide plate according to item 1 of the scope of patent application, wherein a scattering dot array is arranged on the bottom surface. 1 2. The light guide plate according to item 11 of the scope of patent application, wherein each scattering point in the scattering point array can be micro-shaped, spherical, cylindrical, cubic or pyramidal. 1 3. The light guide plate as described in item 12 of the scope of the patent application, wherein the size of the scattering point increases in a direction away from the light incident surface. 1 4. A surface light source device comprising: a light guide plate including at least one light incident surface i for receiving incident light i a light exit surface adjacent to the light incident surface and a light exit surface adjacent to the light exit surface The opposite bottom surface; at least one light source disposed on a side corresponding to the light incident surface; wherein the bottom surface includes at least one inclined surface and a surface connected to the inclined surface and parallel to the light exit surface. 15. The surface light source device according to item 14 of the scope of patent application, wherein the bottom surface is trapezoidal. 16. The surface light source device according to item 14 of the scope of patent application, wherein a reflective plate for reflecting light emitted from the light source to the light guide plate is provided on the outer side of the light source. (1 7. The surface light source device as described in item 16 of the scope of patent application, wherein the reflecting plate includes a surface having a high reflectivity relative to the bottom surface of the light guide plate 0 1 8. As the item 14 of the scope of patent application In the surface light source device, the light exit surface is provided with a V-shaped groove array. Page 15 200422670 6. Scope of patent application 1 9. The surface light source device described in item 18 of the scope of patent application, wherein the V-groove array is distributed at the same density. 20. The surface light source device according to item 18 in the scope of the patent application, wherein the V-shaped angle of the V-shaped groove array is gradually increased in a direction away from the light incident surface. 2 1. The surface light source device according to item 18 of the scope of patent application, wherein the groove height of the V-shaped grooves of the V-shaped groove array increases in a direction away from the light incident surface. 2 2. The surface light source device according to item 18 of the scope of patent application, wherein the groove width of the V-shaped ¥ of the V-shaped groove array increases in a direction away from the light incident surface. 2 3. The surface light source device described in item 20 of the scope of patent application, wherein the V-shaped angle of the V-shaped groove ranges from 70 degrees to 110 degrees. 2 4. The surface light source device according to item 21 of the scope of patent application, wherein the groove height of the V-shaped groove is 20 // m to 100 // m. 25. The surface light source device according to item 22 of the scope of patent application, wherein the groove width of the V-shaped groove is 50 // m to 200 // m. 2 6. The surface light source device according to item 14 of the scope of patent application, wherein the bottom surface is provided with a scattering point array. 2 7. The surface light source device according to item 26 of the scope of application for a patent, wherein the structure of the scattering point is micro-shaped, spherical, cylindrical, cubic, or gold tower. 2 8. The surface light source device according to item 27 of the scope of patent application, wherein the size of the scattering point 傺 increases in a direction away from the light incident surface. Page 16 200422670 6. Application for patent scope 2 9. The surface light source device as described in item 14 of the scope of patent application, wherein the surface light source device further includes a diffusion moon that uniformly diffuses the light output from the light exit surface. .