TWI286644B - Backlight module - Google Patents

Abstract

A back light module comprises a light guide plate, and a plurality of dot light sources. The light guide plate has a light input side, a light output surface, and a bottom surface opposite to the light output side. The plurality of light sources are installed opposite to the light input side. A plurality of elliptic cavities are formed in the light guide plate and near close to the light input side, so the light emitted from the dot light sources has large divergent angle.

Description

1286644

[Technical Field] The present invention relates to a backlight module, particularly a backlight module of the present invention. [Prior Art] It is applied to liquid crystal display. Due to the advantages of light, thin, and low power consumption of liquid crystal display devices, it is widely used in notebook computers, mobile phones, and personal digital assistants. Since the liquid crystal itself does not have a light-emitting property, it is necessary to provide a back second, and the display function is now provided. Mistakes, and

The conventional backlight module includes a light source and a light guide plate. The light source is disposed opposite to the light incident surface of the light guide. The light guide plate guides the transmission direction of the light beam emitted from the light source, and converts the line light source or the point light source into a surface light source. The bottom surface of the light guide is distributed with a plurality of dots for destroying the all-beam condition of the light beam transmitted inside the light guide plate, and scattering it to improve the uniformity of the light beam emitted from the light guide plate, thereby improving the overall performance of the backlight module. The density and size of the outlets can be designed to suit different backlight modules.

A prior art backlight module can be referred to the first figure. The backlight module 9 is composed of a light guide plate 10 > a translucent material plate 2 〇, a reflective material case 3 〇 and a light source 4 。. The translucent material board 2 is disposed on the light guide plate 10, and the light guide plate 1 and the bottom surface 12 are contained in the reflective material box 3, and the positioning material groove 30 is opened on one side of the reflective material box 30. The light source 40 is housed therein. During operation, the light beam emitted by the light source 40 is incident from one side of the light guide plate 1 , and is generated by the gradation wave pattern of the bottom surface of the light guide plate 1 and the reflective material box 3 产生 to generate a planar light 'self-light guide plate 10 The light-emitting surface is ejected, and the translucent material plate 2 is plated with a scattering film (not shown) to make the planar light distribution more uniform.

Page 5 1286644 V. Description of invention (2) ' ----, dream and 凊: ί 麦 read the second picture, 'Because the light source 40 has a fixed divergence angle, such as W's emission angle can be 3 〇 to 1 30 degrees, and the light guide plate 1 〇 opposite, A =, the side of the plane plane 'such that the light beam emitted by the light source 40 0 through the side into the light guide plate 1 〇, its divergence angle will be further reduced, the maximum is about • 6 53 degrees or so, which produces a large dark band on the incident side of the light guide plate 10, and further reduces the utilization of light energy, affecting the brightness and uniformity of the light output of the backlight module 9 or even the liquid crystal display using the backlight set 9. .

The third figure is a backlight module which can reduce the incident dark band of the light guide plate disclosed in Taiwan Patent No. 5,309,91, which is published on January 2nd, 2nd. The backlight module is provided with a plurality of recesses 1 〇 on the light guide plate 3, and the plurality of recesses 10 are arranged in front of the incident point 2 of the point source. A plurality of concave holes 1 〇 are arranged in front of each incident point 2 of the point light source, and the plurality of concave holes 1 〇 can penetrate through the light guide plate 3 ′ when the incident light contacts the outer edge of the concave hole 1 产生 to generate light refraction or total light reflection effect It can destroy the strong optical directivity of the point source and increase the light divergence angle, which helps to improve the defect of the dark band on the incident side of the light guide plate 3.

However, the recess 10 is arranged in the vicinity of the light incident surface of the light guide plate 3, and the total light reflected by the incident light contacting the surface thereof is such that the incident light that has entered the light guide plate 3 is reflected back and continues toward the inside of the light guide plate 3. The amount of light transmitted is reduced, the light utilization efficiency and the brightness of the backlight module are reduced; and the plurality of recesses 10 are formed inside the light guide plate 3, and the light is refracted and reflected on the surface of the cavity 1 so that the light is incident on the inside of the light guide plate. The light energy loss; in addition, the refractive index of the cavity 1 is different from the refractive index of the light guide plate 3, hindering the deep transmission of the incident light, and the light intensity of the smaller area where the incident point is surrounded by the cavity 1 is stronger. Area

Page 6 1286644 V. Inventive Note (3), due to the reduction of the amount of incident light, the obstruction of the cavity and the scattering energy loss, the light intensity transmitted to the larger area is weak, affecting the light guide plate. Light uniformity and brightness. In view of this, it is necessary to provide a backlight module with high uniformity of light output. SUMMARY OF THE INVENTION The object of the present invention is to provide a backlight module light-emitting module having high light-emitting uniformity. In the light-emitting surface of the light-emitting surface, the light-emitting surface of the light-emitting surface is in the light-emitting surface of the light-guide plate, and the light-conducting light source is similar to the light-incident surface of the light-emitting surface. The ellipse further includes a bottom light panel. The half-front technology is configured to provide a light-emitting uniformity, and a light-emitting surface is connected to the light-incident surface. a surface and a plurality of point light sources, the plurality of point light sources are disposed adjacent to the light incident surface and disposed on the light incident surface, and the backlight module includes a light incident surface, a light incident surface, and a light incident. The plurality of point sources are disposed adjacent to the light incident surface with an elliptical groove vertical, and the plurality of elliptical grooves are arranged in parallel with the entrance due to the number of the elliptical or semi-elliptical pairs of the backlight of the present invention. The light surface and the light guide plate and the plurality of points are forever, ... the nine-rain, the surface-connected light is arranged facing the light-incident surface, and the plurality of semi-expanded circular surfaces are parallel to the light-guiding groove adopted by the light-increasing module. The complex The phase is in the middle of the function, the semi-ellipse shape is also 1^· Page 7 1286644 V. Invention Description (4) Similar to the function of a concave lens, both of which can make the point source emit and enter the light beam of the light plate After obtaining a larger divergence angle, the light distribution is more uniform', thereby effectively reducing the dark band area and improving the optical quality of the backlight module. [Embodiment] Please refer to the fourth figure. The backlight module i 〇 本 of the present invention comprises a light guide plate 200, a first reflection sheet 300, a second reflection sheet 4, and a plurality of point light sources 5?. The point light source 5 is used to emit a light beam, and the light guide plate 2 〇〇 guides the point light source 50 to emit a light beam, and converts it into a surface light source. The point light source 500 is a light emitting diode or a small light bulb, and the nine colors and the brightness can be formulated by arranging a plurality of different colors of the light emitting diode or the small light bulb. The heart is immersed in the light board 200 is a flat-shaped light guide plate, made of transparent material such as acrylic, * or polycarbonate, which includes a light-incident surface 22: the light surface 220 is connected to the light surface 240 and a bottom surface opposite to the light-emitting surface 240, and the light-incident surface 220 is configured to receive the light beam/exchange 60 emitted by the point light source 5. Antireflection film (not shown). The illuminating surface 240 can be processed to have a rough surface that is turned over. The light guide plate 2 is provided with a plurality of dots (chaining degree) to increase the brightness and uniformity of the light beam emitted from the light guide plate 200. The size of the unpointed point is increased in a direction away from the light incident surface 2 2 0 . For the β ^ the net, the dots can be distributed in the form of guide, ♦, and spherical for printing or injection molding. Face 260. The bottom of the ninth board is 2 ϋ 弟 弟 一 反射 反射 反射 3 3 3 3 3 3 3 3 3 3 3 3 设置 反射 反射 反射 反射 反射 反射 反射 反射

1286644 V. Description of the Invention (5) The light emitted from the bottom surface 260 is reflected back into the light guide plate 2 〇 , to improve the light utilization efficiency of the backlight module 100. Please refer to the fifth figure together for the top view of the light guide plate 2 〇 〇 and the point light source 50 0 of the backlight module 1 . The light guide plate 2 further includes a plurality of elliptical grooves 280 located in the side of the light guide plate 2 near the light incident surface 220, and the number and position thereof are matched with the plurality of point light sources 5〇. The plurality of elliptical grooves 280 are integrally formed with the light guide plate 2, and the light exiting surface 24 is 〇 ’ and the long axis of the cross section thereof is parallel to the light incident surface 22 〇 and the bottom surface 26 〇.

The plurality of elliptical grooves 280 are linearly arranged in a direction parallel to the lenticular surface with a spacing therebetween. 4, the first reflective sheet 400 is a strip-shaped strip, which is disposed on the light-emitting surface 24 [one side" and opposite to the plurality of elliptical grooves 28 8 ,, which may be due to the plurality of elliptical grooves 280 The light that is reflected off and reflected out is reflected back into the light guide plate 200, thereby improving the light utilization efficiency of the backlight module 1 . Please refer to the sixth figure, which is the way the light passes through the plurality of elliptical grooves. Since the elliptical groove 28 is filled with air, the air

The I strike rate is 1, and the light index of the light guide plate 2 is greater than 1, 2 '. The rounded groove 280 can be regarded as two oppositely disposed concave lenses. The enlarged circular groove 2 80 has a two-arc surface "deferred - ςπΛ tm (not marked), and the light emitted from the complex point light source 500 passes through the light incident surface λ $ grabs γ κ 4 After the special surface 220 enters the light guide plate 200, the divergence effect can be generated by the multiple refraction of the two curved surfaces. From the complex point light source 5 0 〇Μ 4», * X $ ^ M m ^ ^00 The light of the light guide plate 200 acts through the plurality of elliptical grooves 280, which can travel to the blood of the bucket, and the divergence effect is generated in the a*^n", so that the light is more uniform, and the giJL can be effectively solved. Area to improve the backlight module 100

1286644 V. Description of invention (6) Uniformity of light output. However, the light guide plate 200 may also be a wedge shape, and the dot may also be in the shape of a square, a pyramid, or other suitable shape. Alternatively, "51# 26 0 may be provided with a plurality of grooves (not shown) instead of the plural. a dot, the: 260 may also be plated with a reflective film instead of the first reflective sheet 3'. - Figure 7 is not a partial view of the light guide plate and the point source of another backlight module 6 of the present invention. The backlight module 6 is different from the backlight module described above in that the core backlight module 600 includes a plurality of semi-elliptical grooves with respect to the plurality of elliptical grooves 28A of the backlight module 68〇, the half θ ^

The 680 includes a vertical surface 682 and a curved surface m, wherein the surface/surface is on the light incident surface (not shown) of the backlight module 600. Please refer to the eighth figure, which is a schematic diagram of the light path of the light passing through the plurality of semi-elliptical grooves 68〇. The semi-elliptical groove 68 is filled with air, and the refractive index of the air is 1, and the refractive index of the material of the light guide plate (not shown) is greater than 1. Further, the elliptical groove 680 can be regarded as a concave lens. When the light passes through the vertical surface 682, no divergence effect is generated. However, when the curved surface 684 is passed, a strong divergence effect can be generated, so that the light is more uniform, and the dark band area can be effectively solved to improve the backlight module. Light uniformity. However, the design of the backlight module 600 also has a plurality of similar backlight modules. As described above, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above is only a preferred embodiment of the present invention. Those who are familiar with the art of the present invention are in the spirit of the invention.

Page 10 1286644 V. Equivalent modification or variation of the invention (7) shall be included in the scope of the following patent application. 1286644 Simple description of the drawing ί: [:: An exploded view of the prior art backlight module. A picture of the prior art shown in the picture of the younger brother. The third picture is a three-dimensional fish display of the backlight module of the present invention: a surface view. The fifth figure is the light guide plate of the backlight module of the present invention. The sixth figure is the part of the backlight module of the present invention. Part of the top view. The seventh figure is another backlight pattern of the present invention. ¥First board and point light source part overlook

The eighth figure is a schematic diagram of a part of the optical path of another backlight module of the present invention. [Main component symbol description] Light source entrance surface semi-elliptical groove Second reflection sheet orphan plane 6 8 4 5〇〇220 260 680 4〇〇Backlight module 1〇〇, 6〇〇Light guide plate 200 Light-emitting surface 240 elliptical groove 2 8 0 first reflection sheet 300 vertical surface 682

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Claims (1)

1286644 6. Patent application scope 1. A backlight module, comprising: a light guide plate, comprising: at least a light-incident surface, a light-emitting surface connected to the light-incident surface, and a bottom surface of a light-emitting surface; and a plurality of a point light source of the light beam is disposed opposite to the light incident surface; wherein a plurality of elliptical grooves are disposed adjacent to the light incident surface of the light guide plate to match the point light source, and a long axis of the cross section of the elliptical groove is parallel to the light incident surface And the bottom surface. 2. The backlight module of claim 1, wherein the plurality of elliptical grooves are linearly arranged in a direction parallel to the light incident surface. 3. The backlight module of claim 1, wherein the point light source is a light emitting diode or a small light bulb. 4. The backlight module of claim 1, wherein the light guide plate is in the form of a flat plate or a wedge. 5. The backlight module of claim 1, wherein the bottom surface is provided with a plurality of regularly distributed dots or V-shaped grooves. 6. The backlight module of claim 1, further comprising a first reflective sheet on a side of the bottom surface. 7. The backlight module of claim 1, wherein the bottom surface has a reflective film. 8. The backlight module of claim 1, wherein the light exiting surface has a thick chain surface of a certain thick chain. 9. The backlight module of claim 1, wherein the light incident surface is coated with an antireflection film. 1 0. The backlight module of claim 1, further comprising Page 13 1286464 VI. Patent Application Scope 2nd Anti-circular groove 11. A backlight light guide film setting module is located on one side of the light emitting surface, and is matched with the plurality of elliptical light surfaces for use therein, the groove With the incoming light 12. If you apply for a special elliptical concave 1 3 . If you apply for a special source of light 1 4. If you apply for a special board can be flat 1 5 · If you apply for a special set of plural 16 · If you apply for a special first reverse 1 7. If the application is specially plated with reflections 1 8. If the application is for a special system, the application includes: • the application includes: at least one light entrance surface, one connected to the light entrance surface and a bottom surface opposite to the light exit surface; a point source of the beam, which is disposed opposite to the light incident surface; a plurality of semi-elliptical concave sources are disposed adjacent to the light incident surface, and the vertical plane of the semi-elliptical groove is parallel to the smooth surface of the light guide plate Along the range of the range of the diodes, the range of the shape of the diode or the range of profit margins, the range of film, the range of film. The backlight module of claim 11, wherein the plurality of pixels are linearly arranged parallel to the direction of the light incident surface. The backlight module of item 11, wherein the spot light or the small light bulb. The backlight module of item 11, wherein the light guiding wedge shape. The backlight module of item 11, wherein the bottom surface is a mesh dot or a V-shaped groove. The backlight module of item 11, further comprising a side of the bottom surface. The backlight module of claim 11, wherein the backlight module of the bottom surface of the item 11 has a rough surface of the emitted light. The backlight module of item 11, wherein the light entering the light Page 14 1286644 VI. Patent Application The surface is coated with an anti-reflection coating. The backlight module of claim 11, further comprising a second reflection sheet disposed on a side of the light exit surface and disposed in conjunction with the plurality of elliptical grooves. » Page 15