TWI224233B - Improved back light module - Google Patents

Abstract

This invention relates to an improved back light module that the special design of light guild plate can prevent from the non-uniform of illumination. The module includes: a light source; a reflector below said light source to reflect back the downward light rays for increasing the illumination of the back light module; and a light guild plate on said light source, wherein the section of the bottom of the light guild plate above said light source is a plane and the other section of the bottom of the light guild plate has a plurality of bump for focusing the light rays to increase the illumination thereof.

Description

1224233 No. 3 92102734

V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a large-scale liquid crystal display, and particularly to a large-scale liquid crystal display with a backlight module having a direct-type lamp structure. [Prior art] Because the liquid crystal itself does not emit light, it is necessary to have a light emitting module to make the liquid crystal emit light to a proper brightness so that it can be displayed on the screen when there is no light. For laptops, 70% of the power is consumed by light-emitting modules. Therefore, improving the brightness of the light-emitting module, or using the lower power light source to obtain the same shell degree, can improve the efficiency of the light-emitting module and save power consumption. Λ 'is widely used in large-scale liquid crystal display light-emitting module structures, and is generally based on a direct-type lamp structure of the backlight module 11 〇, please refer to the first figure and shown, which includes: a light source 112;- Light guide plate 114; a reflection sheet π 6;-a diffusion sheet 1 1 8; and a diamond lens 1 2 0. The light source 1 1 2 is composed of a row of Cold Cathode Fluorescent Lamps (CCFL). 'But we can also use a matrix formed by light emitting diodes (LEDs) instead of the aforementioned cold cathodes. Light Tube (CCFL). The light guide plate 1 14 is usually made of acrylic (Polymethyl Acrylic Acid Methyl Acetate ’PMMA) or Optical Plastic (Pastic Division, commonly known as

1224233 _Case No. 92102734_Year_Month_Revision_ V. Description of the invention (2) plastic or plastic material), which contains 50 ~ 80% titanium dioxide (Ti〇2) diffusion particles 122, its role is to When the light emitted by 112 penetrates and exits toward the surface of the light guide plate 1 1 4, it encounters titanium dioxide (τ i 0 2) diffusion particles 1 2 2 and can be more uniformly scattered. The reflecting sheet 1 1 6 is placed under the light source 1 1 4 to reflect the light emitted downward from the light source 1 1 2 or the light reflected downward when entering the light guide plate 1 1 4 and reflects back toward the light guide plate 11 4 again. To increase the brightness of the backlight module 110. A diffusion sheet 118 and a diamond lens 120 are usually added above the light guide plate 114. The number of the two depends on the design of the backlight module 110. The diffusion sheet 118 and the diamond lens 120 are also used to further enhance the light emitting module. Brightness and uniformity. Because light has the nature of waves', the light emitted from the light source 11 2 will have a significant wave interference phenomenon on the bottom surface of the light guide plate 11 4, as shown in the second figure. The so-called wave interference phenomenon means that when light rays emitted from different light sources meet at the same position, if these light rays have the same phase, the light rays will have an additive phenomenon, that is, the position will appear brighter; on the contrary, at the same position When the positions meet, if these rays have opposite phases, the light will have a cancellation phenomenon, that is, the position will appear dark. From the second figure ', which is a partial enlarged view of A in the second figure, we can clearly see that there are light and dark patterns on the bottom surface of the light guide plate 1 丨 4. Similarly, when we use a matrix formed by light-emitting diodes instead of cold-cathode lamps, there will also be problems of light wave interference. In addition, the cold cathode lamp is a linear light source, and the light emitting diode is a point.

Page 7 1224233 _Case No. 92102734_ Years and Months Amendment _ V. Description of the invention (3) Light source, the intensity of light emitted by both decreases with increasing distance, so the light guide plate has the largest position directly above the light source The brightness (light intensity) is the shortest because of the distance it travels, and the light guide plate has a smaller brightness (light intensity) because it travels a longer distance. This also causes the problem of uneven light intensity when the light emitted from the light source enters the bottom surface of the light guide plate. [Summary of the Invention] In view of the above-mentioned background of the invention, the large-scale liquid crystal display of the backlight module of the conventional direct-type lamp structure has a problem of uneven intensity when light enters the bottom surface of the light guide plate. The invention provides a backlight module with an improved direct-type lamp structure, which avoids the above situation. An object of the present invention is to provide a backlight module with an improved direct-type lamp structure. The special design of the bottom surface of the light guide plate can solve the problem of uneven light intensity. Another object of the present invention is to provide a backlight module with an improved direct-type lamp structure. The special design of the front of the light guide plate solves the problem of uneven light intensity. According to the above-mentioned object, the present invention provides an improved straight down

1224233

The backlight of the lamp tube structure has the brightness below the light source; and a light guide surface is directly above the light source and the light source A is used to add a module to increase the module, including: a light reflects the light back, a plate A part of the brother on the light source is a plane second part and there are a plurality of light sources of the second part, a reflector is located at the bottom of the light guide plate where the backlight module is raised, and the light guide The bottom surface of the board does not collect bumps, so the strength is used. According to the above concept, the light source is composed of a cold cathode lamp (CCFL). According to the above concept, the light source is formed of a light emitting diode (L £ d). According to the above idea, the material of the light guide plate is acrylic (polymethyl methacrylate, PMMA). According to the above-mentioned concept, the material of the light guide plate is an optical plastic (Plastic Division). According to the above-mentioned idea, the light guide plate further includes 50 to 80% of titanium dioxide (T i 0 2) diffusion particles. According to the above-mentioned concept, the backlight module with an improved plastic direct-type lamp structure further includes a diffusion sheet located above the light guide plate.

1224233 --- Case No. 921Q2734 V. Description of Invention (5)

According to the above conception, the backlight module of the improved direct-type lamp structure includes a diamond lens located above the light guide plate. According to the above-mentioned concept, the first part of the bottom surface of the light guide plate is treated with a matte surface or a mirror surface. According to the above-mentioned concept, wherein the mirror surface treatment is a metal plating on the first part of the bottom surface of the light guide plate by sputtering or evaporation. According to the above concept, the metal is selected from the following: aluminum and silver. According to the above-mentioned purpose, the present invention provides an improved backlight module of a straight tube structure, including: a light source; a reflective sheet; The bottom part is used to reflect the light back so as to improve the backlight module 22 and a light guide plate, which are located above the light source, wherein the first part of the light guide plate directly above the I source is a plane, and the front side of the light guide plate is flat. Above the Lü Hai light source, Xi Chu-μ, ^ ^ ^ t, one of the younger brothers—has a plurality of light-recessing recesses (recesses) to collect light to increase the weaving strength of the second part. According to the above configuration, Xishui. The first source of Fu Xin 4 is the cold cathode lamp (CCFL) group. The source is not based on the above concept. The light source is shaped by a light emitting diode (LED). 1224233 _ Case No. 92102734_ __ 5. Description of the invention (6). According to the above idea, the material of the light guide plate is acrylic (Polymethyl Acrylic Acrylate, PMMA). According to the above concept, the material of the light guide plate is an optical plastic (Plastic Division). According to the above concept, the light guide plate further contains 50 to 80% of titanium dioxide (T i 0 2) diffusion particles. According to the above-mentioned idea, the backlight module of the improved direct-type lamp structure further includes a diffusion sheet located above the light guide plate. According to the above-mentioned concept, the backlight module of the improved direct-type lamp structure further includes a diamond lens located above the light guide plate. According to the above-mentioned concept, the plane of the first part of the front surface of the light guide plate is treated with a matte surface or a mirror surface. According to the above-mentioned concept, the mirror surface treatment is to place a metal ore on the plane of the first part of the front face of the light guide plate by ore practice or steam ore. According to the above concept, the metal system is selected from the following: aluminum and silver.

Implementation methods] Some embodiments of the present invention will be described in detail. In addition, the present invention can also be broadly understood, in addition to: The scope of the present invention is not limited, and its subsequent lines' and please refer to the fourth figure, this is The invented section of the backlight module 10 of the lower type tube structure = a kind of improved split straight I-light guide plate 14;-a reflection sheet i which contains:-a light source 20 Gan occupying τ for a long time 1 b, a diffusion sheet 18; And one of its lenses 20. Among them, the light source 12 is a row of cold cathode lamps = 灯 '乂 4 v), which is described by the following description: cathode lamp tube (CCFL). The light guide plate 14 is usually made of acrylic (methyl methacrylate, PMMA) or optical plastic (piastic = V1 ^ i〇n, commonly known as PC material or plastic material), which contains 508 〇% Scattered titanium titan (ΊΊ02) diffusion particles 22, whose function is that when the light emitted from the light source 12 is transmitted through the teeth and emitted toward the surface of the light guide plate 14, the titanium dioxide (Ti 02) diffusion particles 22 can be more modified. Scatter evenly. The reflecting sheet j 6 is placed under the light source 1 4 to reflect the light emitted downward from the light source 丨 2 or the light reflected downward when entering the light guide plate 1 4 to reflect back towards the light guide plate 丨 4 to improve the backlight. The brightness of the module 10. A diffuser plate 18 and a diamond lens 20 are usually added above the light guide plate 14. The number of the two depends on the design of the backlight module 10. The diffuser plate 18 and the diamond lens 20 are also used to further enhance the light emitting module. of

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1224233 Revised case number in in. 7: u 5. Description of the invention (8) Brightness and uniformity The first preferred embodiment of the present invention is different from the conventional one in that the bottom surface of the light guide plate 14 is changed from the conventional full plane. It is designed for partial bumps and flat surfaces to improve the problem of uneven light intensity when the light emitted from the light source 12 enters the bottom surface of the light guide plate 14. As shown in the fifth figure, the light guide plate 14 of the present invention remains flat at the portion 24 directly above the light source 12, that is, the light intensity at this portion remains unchanged, and the bottom surface of the light guide plate 4 is not at the portion 2 directly above the light source 12. 6 has a plurality of bumps, which are used to gather light to increase the light and intensity of this part, in this way, to improve the uniformity of the light on the bottom surface of the incident light guide plate, thereby preventing the generation of bright and dark patterns. In addition to the protection of the parts 24, they can also be treated with a matte or mirror surface to reduce or reflect incident light that further improves the light on the bottom surface of the incident light guide plate: part; the metal material can be deposited by means of low-level plating or vapor deposition 丨On the thousands of planes, it is a good choice for the metal material to be aluminum, and the light intensity at this higher part remains unchanged: keep plane, that is, the part 30 directly above has multiple recesses (recess The surface is not at the light source 12 to increase the light intensity at this part. L is used to gather light to the bottom of the board. | The advancing mode is to improve the incident light guide $ and prevent the generation of bright and dark patterns. Department of ministry 12 page 1224233

---- No. 1 92102734_Introduction of the invention (9) Bit 28 In addition to maintaining a flat surface, we can also apply a matte or mirror treatment to reduce or reflect the intensity of the incident light, and further improve the bottom light of the incident light guide. Evenness. Among them, the mirror surface treatment can be used to sputter or vaporize the metal substance on the plane of the part 28. The metal substance can be aluminum or silver. When the reflection requirements are lower, aluminum is a good choice, and For high reflection needs, we can use silver instead. Even though the present invention is not limited to the specific embodiments listed by the enumeration of the present invention, it is within the scope of the equivalent patent application that the equivalent modification completed in the obvious spirit. In addition, other similar completions in spirit are within the scope of the patent application of the present invention, and the scope of the present invention is described by including several preferred embodiments, but the embodiments. Although previously listed and described, 'other changes or modifications that do not depart from the disclosure of the present invention should be included in the present invention. All other changes or modifications that do not depart from the disclosure and approximation of the present invention also include: Definition to explain some modifications and similar structures.

1224233 _Case No. 92102734_ Year Month Revision _ Brief Description of Drawings [Simplified Illustration of Drawings] The first drawing shows a schematic cross-sectional view of a backlight module that is conventionally applied to a large-scale liquid crystal display with a direct-type lamp structure; The second figure is a perspective view of a backlight module that is conventionally applied to a large-sized liquid crystal display with a direct-type lamp structure. The third figure is an enlarged view of the area A in the second figure;

The fourth figure shows a schematic cross-sectional view of the first preferred embodiment of the backlight module of the direct-type lamp structure of the present invention applied to a large-scale liquid crystal display; and the fifth figure shows the application of the present invention to a large-scale An enlarged detailed cross-sectional view of a first preferred embodiment of a backlight module of a direct-type lamp structure of a liquid crystal display.

The sixth figure shows an enlarged schematic detailed cross-sectional view of the second preferred embodiment of the backlight module of the direct-type lamp structure applied to a large-scale liquid crystal display of the present invention. Description of graphical symbols: 11 0: Conventional backlight module with direct-type lamp structure

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Page 16 1224233 _Case No. 92102734_Year Month Day_Modified illustration of simple diagrams 120, 20: Diamond lens 122, 22: Titanium dioxide (Ti02) diffusion particles 2 4: The first part of the bottom surface of the light guide plate, plane 26: Light guide plate The second part of the bottom surface, bump 28: the first part of the front surface of the light guide plate, the plane 30: the second part of the front of the light guide plate, recess

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Claims (1)

1224233 --- Case No. 92102734_Year Month, τ VI. Patent application scope Patent scope: 1 · An improved backlight module with direct-down lamp structure, including: a light source; a reflective sheet located on the light source And a light guide plate located above the light source, wherein a bottom surface of the light guide plate is flat at a first portion directly above the light source, and a bottom surface of the light guide plate The second part not directly above the light source has a plurality of light-concentrating bumps for collecting light to increase the light intensity of the second part. t. The moonlight right group of the improved direct-type lamp structure as described in item 1 of the + Shenjing patent scope, wherein the light source is composed of a cold cathode lamp (CCFL). As described in item 1 of the / eye patent scope, the "direct-type lamp structure of the improved type" of the moon "twig group, wherein the light source is formed by a light emitting diode (LED). Application, patent scope, No. 1 The material of the light guide plate in the second M'A f of the improved direct-type lamp structure described in the item is acrylic (polymethyl methacrylate, PMMA) 〇5Back ~ Λ'gangan The D · • Wu, and ',, of the improved direct-down lamp tube structure described in item 1 above are made of optical plastic (Plastic Division). Page 18 1224233 _Case No. 92102734_ Year Month__ VI. Patent Application Scope 6. The backlight module of the improved direct-type lamp structure described in item 1 of the patent application scope, wherein the light guide plate further includes 50 to 80% of titanium dioxide (Ti 02) diffusion particles. 7. The backlight module of the improved direct-type lamp structure described in item 1 of the patent application scope further includes a diffusion sheet located above the light guide plate. 8. The backlight module of the improved direct-type lamp structure described in item 1 of the scope of the patent application further includes a diamond lens located above the light guide plate. 9. The backlight module of the improved direct-type lamp structure described in item 1 of the scope of the patent application, wherein the plane of the first part is treated with a matte surface. 10. The backlight module of the improved direct-type lamp structure described in item 1 of the scope of the patent application, wherein the plane of the first part is mirror-finished. 11. The backlight module of the improved direct-type lamp structure described in item 10 of the scope of patent application, wherein the mirror surface treatment is a method in which a metal is plated on the plane of the first part by sputtering. 12. The backlight module of the improved direct-type lamp structure described in item 11 of the scope of patent application, wherein the metal is selected from the following: aluminum and silver. 1224233 on page 19 ------ j 92 92 彳 02734 service j_§ ------- VI. Scope of patent application13. Improved straight down tube structure as described in item 丨 〇 of patent application scope In the backlight module, a metal is plated on the plane of the first part by vapor deposition. 14. The backlight module of the improved direct-type lamp structure described in item 3 of the patent application scope, wherein the metal is selected from the following: Ming and silver. 15 · —A kind of backlight module with improved direct type tube structure, including · A light source; a reflective sheet located below the light source to 'reflect light back' to improve the brightness of the backlight module; and a light guide plate positioned above the light source 'wherein the front face of the light guide plate is directly above the light source The first part is a plane, and the light guide plate has a plurality of condensing recesses in a second part that is not directly above the light source, and is used to gather light to increase the light intensity of the second part. 16. The backlight module of the improved direct-type lamp structure described in item 5 of the patent application scope, wherein the light source is composed of a cold cathode lamp (C C F L). 17. The backlight module of the improved direct-type lamp structure described in item 15 of the scope of the patent application, wherein the light source is formed by a light emitting diode (LED). 18. The backlight module of the improved direct-type lamp structure described in item 5 of the patent application scope, wherein the material of the light guide plate is acrylic (polymethyl propylene) Page 20 1224233 _Case No. 92102734_ Year Month Amendment_ VI. Scope of patent application (methyl ester, PMMA). 19. The backlight module of the improved direct-type lamp structure described in item 15 of the scope of patent application, wherein the material of the light guide plate is an optical plastic (Plastic Division) 〇20. In the backlight module of the improved direct-type lamp structure described above, the light guide plate further contains 50 to 80% of titanium dioxide (Ti02) diffusion particles. 21. The backlight module of the improved direct-type lamp structure described in item 15 of the patent application scope further includes a diffusion sheet located above the light guide plate. 22. The backlight module of the improved direct-type lamp structure described in item 15 of the scope of the patent application further includes a diamond lens located above the light guide plate. 23. The backlight module of the improved direct-type lamp structure described in item 15 of the scope of patent application, wherein the plane of the first part is treated with a matte surface. 24. The backlight module of the improved direct-type lamp structure described in item 15 of the scope of the patent application, wherein the plane of the first part is treated with a mirror surface. 25. The backlight module of the improved direct-type lamp structure described in item 24 of the scope of patent application, wherein the mirror surface treatment is a method of plating a metal by sputtering. Page 21 1224233 _Case No. 92102734_Year_Month__ Sixth, the scope of the patent application is in the plane of the first part. 2 6. The backlight module of the improved direct-type lamp structure described in item 25 of the scope of patent application, wherein the metal is selected from the following: aluminum and silver. 27. The backlight module of the improved direct-type lamp structure described in item 24 of the scope of the patent application, wherein the mirror surface treatment is a method in which a metal is plated on the plane of the first portion by vapor deposition. 28. The backlight module of the improved direct-type lamp structure described in item 27 of the scope of patent application, wherein the metal is selected from the following: aluminum and silver. Page 22