TW581852B - Flat lighting structure for dual display - Google Patents

Abstract

A flat structure for dual display includes two light sources and a light guide plate. The light guide plate has two transferring surfaces to introduce light from the two light sources to opposite direction, and has two transparent dielectric with different light reflecting indices, in which one transparent dielectric is between the two transferring surfaces and the other transparent dielectric is outside the two transferring surfaces.

Description

V. Description of the invention d) One 1 Field of the invention A double-sided display with a planar light source, especially a planar light source structure with dual display.疋 Related to 5-2 background of the invention: The display device at midnight is a scanner or two. In the existing and f-plane light sources, such as liquid crystal display diodes, most of them are point light sources, such as fluorescent tubes. If you need to use: ί: the first source is a linear 1 such as a cold cathode 氺 wave from the use of a planar light source, one way is to arrange the spleen lr first source into an array, or 疋 Λ 疋 will not only the above point : 疋 Linear light sources arranged in a row. However, this side works. The phase ... costs' is quite different in terms of cost: square P · ,, id One way to form a planar light source is to use a light guide plate (light e Pate) 〇 As shown in Figure A and Figure _B The light guide A is a wedge-shaped plate (Wedg0 plate 10 or flat plate 20. It is not equal to the wedge-shaped plate of the first picture or the flat plate of the first picture B, so the second light source will be located at the end " 12, 22 Introducing the light guide plate ^ First, all V-shaped cut planes or dots will be used to export the light source upwards. At present, there are many improvements in the use of the wedge-shaped light guide plates shown, such as the United States and the United States. Figure-Α Patent 20 02000 5 99 1. It is a diamond mirror located on the pilot board of W ’s announced bulletin number to prevent straight 1 Page 5 581852 5. Description of the invention (2) Seeing the light from the light source for improvement However, the planar light source obtained by these two methods still has inherent disadvantages. First, as shown by the wedge-shaped plate in the first A diagram, the brightness of the light source i 2 is usually concentrated in Close to one third of the length of the light guide plate of the light source 12, there is a problem of unevenness of the left and right uniformity of the light source. In addition, as shown in the figure No, using the flat light guide plate 20 of the two light sources 22 can reduce the light uniformity problem, but the brightness in the middle of the light guide plate 20 is the most important way to solve the uniformity of the light source, such as The second picture shows the structure: light ^ ^ proposed, mainly to provide a hollow light guide plate junction emitted by two side light sources 30 after passing through the lens sheet 32, and then by the refractive conditions of the specific reflection conditions and the specific reflection conditions and Two specific plates for the control sheet 36. In addition, the light is directed to the surface brightness of the liquid crystal display via the lens group 38. Then, two reflection sheets 40 are added to the bottom of the two transparent areas 34 to increase the difficulty. = 'This kind of complex planar light source structure' will not only increase manufacturing and labor costs, but also reduce the yield rate of the manufacturing process. Purpose and overview: In the background of the invention, the traditional planar light source The main purpose of the invention produced by the structure is to provide a

Page 6 581852 V. Description of the invention (3) Furthermore, the dual light source planar light source structure of the light guide plate made of the same material with the same optical refractive index will reduce the loss of light energy when the light passes through the light guide plate, making the k 幵 planar light source Structural exemption. Another object of the present invention is to increase the life of a dual light source planar light source structure. Another object of the present invention is to hollow out the middle of the light guide plate to reduce the loss of light quantity, thereby improving the brightness of the dual light source planar light source structure. the amount. Another object of the present invention is to reduce the weight of the dual-light source planar light source structure. According to the above-mentioned object, the present invention provides a planar light source structure for dual displays, which includes two light sources and a light source located between the two light sources. The light guide plate, wherein the light guide plate has two turning surfaces for guiding the light emitted by the two light sources to the two light emitting surfaces in opposite directions. The light guide plate has two transparent media with different light refraction coefficients, one of which is located between the two turning surfaces' and the other transparent medium is located between the two turning surfaces and the two light emitting surfaces. The two turning surfaces described above have a V-shaped cut surface, and the two light emitting surfaces have a 7-shaped cutting surface or a halftone dot. The present invention also provides a planar light source structure for dual displays including a light guide plate 'and two lens groups. The first light incident surface of the light guide plate has

Page 7 581852 V. Description of the invention (4) A first light source has a first turning surface for turning the light from the first light source outside, and the light guide plate has a light source with a second light guide plate. The second light incident mask has a first light emitting surface, and at the same time, the light guide plate has a second light redirecting light source of the light guide plate to a second light emitting surface, wherein the first is used to direct the first to the second light emitting surface. The first turning surface and the second turning surface are relatively smooth, and the light from the first light source and the second light source enter the interface, and the medium must pass through. The two lens groups are respectively located on the light entrance surface and the second light exit surface of the light plate. No. 5-Detailed Description of the Invention: Some embodiments of the present invention will be described in detail as follows. However, in addition to the above description, the present invention can be widely implemented in other embodiments. The scope of the present invention is not limited, which is subject to the scope of subsequent patents. Moreover, the present invention mainly provides a planar light source address used in dual displays: comprising two light sources and a light guide plate located between the two light sources, and: ==: = facing to use the aforementioned two light sources The emitted light guides a light-emitting surface. The light guide plate has two different transparent media. The medium-to-transparent media is located between the two turning surfaces: one transparent medium is located between the two turning surfaces and the two light emitting surfaces. The two steering surfaces mentioned above have v-shaped cuts

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V. Description of the invention (8) The advantages of the embodiments described above, 'can exist independently of each other or be used at the same time', all depend on the user's requirements for the planar light source. 0 The present invention uses different light refractive index media as light guide plates There are indeed quite good advantages. Especially when one of the media is vacuum or air, the light passing through the light guide plate will reduce the loss of light energy, thereby increasing the brightness of the dual-light source planar light source structure and increasing the service life of the dual-light source planar light source structure. . In addition, the hollow light guide plate can reduce the weight of the dual light source planar light source structure. — The above are only preferred embodiments of the present invention, and are not intended to limit the scope of patent application for the present invention; all other equivalent changes or modifications made without departing from the spirit disclosed by the present invention shall include Within the scope of the following patent applications.

Page 581852 Simple illustrations Simple illustrations: Figure A shows a schematic diagram of a conventional planar light source with a wedge-shaped light guide; Figure B shows a conventional planar light source with a flat light guide. No intention,

The second figure shows a schematic diagram of Fujitsu's planar light source structure with a hollow light guide plate; the third figure shows a schematic diagram of a preferred embodiment of a dual display planar light source structure of the present invention; the fourth figure shows a dual light source structure of the present invention A schematic diagram showing another preferred embodiment of a planar light source structure; a fifth diagram showing a schematic diagram of another preferred embodiment of a dual display planar light source structure of the present invention;

FIG. 6 shows a schematic diagram of a preferred embodiment of a light source structure with a primary display panel and a secondary display panel according to the present invention; and FIG. 7 shows a light path when the thickness of the wedge-shaped light guide plate is uneven.

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Claims (1)

Case No. 911230fU 6. Scope of patent application Patent scope: Amend JO. Year and month! 1 · A planar light source structure used in dual display devices, including two light sources; and a light guide plate located in the two Between two light sources, the light guide plate has two :: is used to guide the light emitted by the two light sources in opposite directions to the light surface, and the light guide plate has two transparent media with different light refractive indexes. A transparent medium is located between the two turning surfaces and the other is transparent; the mass is located between the two turning surfaces and the two light emitting surfaces. 2 · The surface light source structure for dual displays as described in item 1 of Shenyan's patent scope, in which the two turning surfaces mentioned above have a ¥ -shaped cut surface. 3. The planar light source structure for dual displays as described in item 2 of the patent application scope, further comprising two diffusers between the light guide plate and the two light sources. 4 · As claimed in item 2 of the patent application, the planar light source structure used in dual displays' further includes two lens groups located on two opposite light emitting surfaces of the light guide plate, respectively. 5 · If the surface light source structure of the dual display device used in the second item of the patent application scope includes a reflective sheet on one of the light emitting surfaces. 6 · Section 5 of surface area light source junctions for dual displays as in the scope of patent application 15, page 15 2003.10.19.016 581852 amended open case number 91123064 6. The scope of the patent application 'where the reflective sheet has 7. A planar light source structure for dual displays, including: two light sources; and a light guide plate, located at Between the two light sources, 'The light guide plate has two dihedral surfaces to direct the light emitted by the two light sources to opposite directions to one or two sides,' and the light guide plate has two transparent media with different light refractive indices. Is transparent; I mass is located between the two turning surfaces, and a second transparent medium is located between the two turning surfaces with β # ^ ^ τ and the light emitting surface, wherein the light refractive index of the second transparent medium is 1 . &η; 1 As the scope of the patent application No. 7 j Xi Xi Tian Shi μ Μ ^ t ^ ^ Yang ^ shell surface light source used in the dual display Is', the above two turning surfaces have a V-shaped section 9 The structure is equal to item 8 of the patent scope, which is used for the surface light source of dual display n. The above-mentioned light guide plate has the first medium on the two light incident surfaces. In the planar light structure of the dual display, two diffusers are further included between the light guide plate and the two light sources.% 11. The planar structure used in the dual display as described in item 8 of the patent application scope further includes two Each lens group is located on the light guide plate = knot. W light Page X 581852 Case No. 91123064 Λ_ Name Amendment Year Month Amendment | VI. Patent Application Range 1 2. If the patent application scope item 7 is used for a dual-display surface light source structure, it also includes a reflective sheet on one of the light emitting surfaces. 1 3 · The planar light source structure for dual displays as described in item 12 of the patent application scope, wherein the reflective sheet has an opening. 1 4. A planar light source structure for dual displays, comprising: a light guide plate, a first light entrance mask of the light guide plate has a first light source, a second light entrance mask of the light guide plate has a second light source, The light guide plate has a first turning surface for turning the light from the first light source to a first light emitting surface of the light guide plate, and the light guide plate has a second turning surface for turning the light from the second light source to A second light emitting surface, wherein the first light emitting surface is opposite to the second light emitting surface, a medium is provided between the first turning surface and the second turning surface, and part of the light of the first light source and the second light source The light entrance surface entering the light guide plate needs to pass through the medium; and two lens groups are respectively located on the first light exit surface and the second light exit surface of the light guide plate. 1 5. The planar light source structure for dual displays as described in item 14 of the scope of patent application, wherein the two turning surfaces described above have V-shaped cut surfaces. 16. If the surface light source structure used in the dual display of item 14 of the patent application scope further includes a reflective sheet on one of the light emitting surfaces. Page 17 2003.19.09.018 581852 Case No. 91123064. The year and month amended -thrift year I 6. Application scope of patent Chu Chong1 7. If the scope of patent application No. 16 is used in a dual-display surface light source structure, of which The reflection sheet has an opening. Ϊ m page 18 2003.10.19.019