TWI264574B - Backlight module and light guide plate thereof - Google Patents

Abstract

A light guide plate used in a backlight module which has a CCFL as light source includes at least one incident surface for receiving an incident light from the CCFL, a bottom surface for reflecting and diffusing the incident light, a light emitting surface for directing the light to emit, wherein, a number of prisms which are vertical to the CCFL source are formed on the at least one incident surface.

Description

1264574

[Technical Field to Be Invented] ‘High m is a backlight module and a light guide plate thereof, and a backlight module and a light guide plate thereof. L no-technical technology] The sunflower-based display module is a non-self-illuminating display device that displays the main light source through the light source or does not pass through, 3 = and the corresponding backlight or front light module, the backlight or The light beam emitted by the front light module ":° light source is directed to the display panel to realize the display function.

The first picture is a moonlight module 1 disclosed in Taiwan Patent Publication No. 547, No. 6-1. The backlight module 1 includes a cold cathode fluorescent lamp (CCFL) light source 11 The light source cover 12 and a light guide plate 13. The light guide plate 13 is substantially wedge-shaped and includes a light incident surface 133 and a light exit surface 132. The CCFL light source 11 is disposed on the light incident surface 131 of the light guide plate 13 of the Hao near light source. The light source cover 12 is disposed on the side of the CCFL light source 11 opposite to the light incident surface of the light guide plate 13. The light exit surface 132 of the light guide plate 13 is distributed. Prism structure 134. The light beam emitted from the CCFL light source 11 is guided through the light incident surface 132 and the bottom surface 133 of the light guide plate 13 through the light exit surface 132.

However, because the length of the CCFL light source 11 is aligned with the side of the light guide plate 13, and the iCCFL light source 11 has an ineffective light-emitting section on one end of the electrode side, the backlight module 1 will have a shadow area in the corner area, regardless of the overall uniformity and visual effect. Both will have adverse effects. In view of this, it is necessary to provide a backlight module and a light guide plate with higher light uniformity. ^

1264574 Light source technology Source length Fraction Another shot or light-like input, energy light guide plate, intersecting output corresponding to the edge distribution of the light distribution. The junction of the optical module is the CCFL light plate inside to the prism 'reducing the angular energy density angle zone and providing a light emission uniformity with the purpose of providing a higher light uniformity CCFL light source. The light guide plate comprises: at least one incident light beam that enters the light and receives the outside; a bottom beam that intersects the light incident, reflects the incident light beam, and a light beam in the light guide plate opposite to the bottom surface is derived; wherein the at least one cloth The structure of the prism, the prism structure and the light source are in the fifth embodiment of the invention. The backlight module of the invention is used for the junction surface. Is used to emit a smooth surface, which divides the smooth side edge into orthogonal distribution of the back of the present invention to receive light into the light source surface opposite to the bottom surface source; wherein the toe structure is compared with the CCFL The front side edge is orthogonal to the light of the light mirror structure of the light mirror structure; the bottom surface and the side back structure of the board are arranged to distribute the central portion of the two light panels to the light module of the light guide plate: one side, one side and one side At least one of the two sides of the light-incident surface is positive in the space, and the back-direction direction of the present invention is distributed into two types. One is that the transmission line is diffused after entering the guided scattering to enhance the light distribution in the area, and the reduction includes at least one of The light surface and a CCFL light having a side with the exit side have a meandering structure, and the light guide plate is configured to enter the light surface, and is transmitted to the light of the light source emitted from the edge light source through the light guiding structure, and the light energy guide of the falling area To achieve the difference in luminance between the central regions

1264574

Different, improve the uniformity of light output. [Embodiment] First::: Fig. 2 and Fig. 3 are respectively a perspective view and a plan view of the backlight module light plate 2'3 and γΪ of the present invention. The backlight module 2 includes a light guide plate 21'. The light guide plate has a flat plate shape, and includes a light incident surface 231, a light exit surface 232 intersecting the light incident surface, and a bottom surface 233 opposite to the light exit surface 232; The two CCFL light sources 21 are disposed opposite to the light incident surface 231 of the light panel 23. The two sides of the two light incident surfaces 231 are orthogonal to the longitudinal direction of the kCCFL light source 21, and the length of the prism structure 235 is equal to the length of the invalid light emitting section 211 of the light source 21. The surface 231 receives the light beams emitted from the two CCFL light sources 21, and the bottom surface 23 3 uniformly distributes a plurality of halftone dots (not shown), which scatter, reflect and direct the light beams to the light exiting surface 232, and the light beam 232 is used to guide the light beam. The light-emitting surface 232 can further be provided with a plurality of strip-shaped 稜鏡 structures 2 3 4 parallel to the light-incident surface 2 31 to improve the brightness and the uniformity. Referring to the fourth figure, the structure of the 稜鏡 structure 235 is enlarged. The prism structure is continuous, the sorghum sorghum is 30 to 50 cm, the 稜鏡 pitch P is 50 to 100 cm, and the apex angle 0 is 90 to 120 degrees. When the backlight module 2 is in operation, The light transmitted to the 稜鏡 structure 2 3 5 is roughly divided into two types, one is the light emitted by the CCFL light source 2 1 to the prism structure 2 3 5; the other is the light entering the light guide plate 23 through the light incident surface 2 3 1 The light passes through the bottom surface of the light guide plate 2 and the side surface (not shown) After the scattered light is transmitted to the Prism structure 235 of the structure 235 of this Prism two light spread

Page 7 1264574 V. Invention Description (4) ϊ能洛i: The amount of the guide wheel in the central area of the light guide plate, enhance this area =:: 2 and then redistribute the difference in brightness of the central area, improve the light output = plate illuminating surface The 稜鏡 structure 234 on the center 2 can converge the optical transmission of the light guiding direction 23 away from the light guiding surface 23 to the center of the light emitting surface, thereby effectively improving the light transmission plate Zd's special transmission coefficient (M〇duiaU〇n can also improve the backlight Module 2's two ^^^ is round, ΪG dual ί : ^ high astigmatism material, its shape is cocoa, from the light::: increase the bottom surface of the light guide, also sunny and see the third figure and the general technology Light-emitting surface on the light-emitting surface of the light guide plate: Pair: Five-picture is the comparison between the invention and the length of the previous light-incident surface, a, b, rain, κ, and knife. Among them, the horizontal axis represents the two end points (see the figure: The light guide surface of the invention is corresponding to the light guide surface of the light guide surface 231 of the light guide plate, and the curve 1 is the luminance distribution of the light output surface of the board: Curve 2 is the light guide of the prior art, and the light guide plate of the present invention is used. 23 of the J 2 f curve 2 can be seen in the 23 light energy distribution, shrinking to redistribute the light guide The uniformity of the light emission. The difference between the brightness of the moon and the central area is improved. Please refer to the sixth figure for the figure of the body. The light module 3 includes the moonlight module. The second light guide plate of the second embodiment is wedge-shaped. Straight-package technology - a light plate 33 and a CCFL light source 31, the light-emitting surface 331 intersecting the light-emitting surface ~ with = connection, light into the light surface 331, a surface and 3 3 3; the light source 31 relative to the light-emitting surface 3 32 opposite bottom, plate 33 light-incident surface 331 is set. Among them, 1264574 5. Description of the invention (5) The light-incident surface 3 3 1 two side edges are orthogonal to the light source 3 1 in the longitudinal direction of the 稜鏡 structure 3 3 5 The prism structure 335 has a length corresponding to the length of the inactive light-emitting portion 31 1 of the CCFL light source 31. The light-incident surface 33 1 receives the light beam emitted from the light source 31, and the bottom surface 33 3 uniformly distributes the plurality of dots (not shown) The light beam is scattered and reflected, and then guided to the light-emitting surface 332, and the light beam is led out by the light-emitting surface 332. Referring to the seventh figure, the structure of the germanium structure 3 3 5 is enlarged, wherein the prism structure is discontinuous. Type, the height D of the molar is 30~50cm, the pitch of the 稜鏡 is 50~150 cm, and the angle of the apex angle When the backlight module 3 is in operation, the light transmitted to the 稜鏡 structure 33 5 is roughly classified into two types, one is the light emitted by the CCFL light source 31 to the 稜鏡 structure 33 5; the other is the The light entering the inner surface of the light guide plate 3 3 1 is reflected or scattered by the mesh point and the side surface (not shown) of the light guide plate 33 and transmitted to the light of the 稜鏡 structure 3 3 5 , and the prism structure 3 3 5 The two types of light diffuse to reduce the transmission of the light energy in the central region of the light panel to enhance the light energy density in the region, thereby realizing the redistribution of the light energy distribution of the light guide plate 33 and narrowing the difference in luminance between the corner region and the central region. Improve the uniformity of light output. The light guide plate and the backlight module of the present invention are not limited to the above structure, and a reflector plate is disposed on the bottom surface of the light guide plate. The reflector plate can reflect the light beam leaking from the light guide plate into the light guide plate to improve the brightness of the light exit surface of the light guide plate. The reflective plate = may be a reflective film that is attached to the bottom surface of the light guide plate. In summary, the present invention complies with the requirements of the invention patent, and the patent application is based on the law. The above is only the preferred embodiment of the present invention, and those who are familiar with the technical strength of the case are in the spirit of the invention. Equivalent

Page 9 1264574 V. INSTRUCTIONS (6) Modifications or variations are to be included in the scope of the following patent application.

Page 10 1264574 Brief Description of the Drawings The first figure is a schematic plan view of a prior art backlight module. The second figure is a perspective view of a first embodiment of a backlight module of the present invention. The third figure is a top view of the backlight module shown in the second figure. The fourth figure is a partial enlarged view of the prism structure of the backlight module shown in the third figure. The fifth figure is a perspective view of the light intensity distribution on the light-emitting surface of the prior art light guide plate. The sixth figure is a perspective view of the second embodiment of the backlight module of the present invention. The seventh figure is a partial enlarged view of the prism structure of the backlight module shown in the sixth figure. [Main component symbol description]

Backlight module 2, 3 CCFL light source 21, 31 Light guide plate 23, 33 Light-incident surface 231, 331 Light-emitting surface 232, 332 稜鏡 Structure 234, 235, 335 Bottom surface 2 3 3, 3 3 3 Ineffective light-emitting segment 2 11 , 3 11

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Claims (1)

1264574 VI. Patent Application No. 1 · A light guide plate matched with a cold cathode fluorescent lamp light source, comprising: at least one light incident surface for receiving an incident light beam of a light source; and a bottom surface intersecting the light incident surface The light beam for scattering and reflecting; a light exiting surface opposite to the bottom surface, wherein the light beam in the light guide plate is led out; wherein the two side edges of the at least one light incident surface are orthogonal to the longitudinal direction of the light source and have a meandering structure . 2. The light guide plate of claim 1, wherein the length of the 稜鏡 structure is equivalent to the length of the invalid illuminating section of the cold cathode fluorescent lamp. 3. The light guide plate according to claim 1, wherein the structure of the crucible is continuous, and the prism has a tooth length of 3 〇 50 50 cm, a prism pitch of 50 〇〇 l 〇〇 cm, and an apex angle. It is 90 degrees to 120 degrees. 4. The light guide plate according to claim 1, wherein the structure of the crucible is discontinuous, the height of the ankle is 30 to 50 cm, the pitch of the crucible is 5 G to 10 cm, and the dome angle is The angle is 90 degrees to 12 degrees. 5. The light guide plate of claim 1, wherein the bottom surface intersects the light incident surface perpendicularly. The light guide plate of claim 1, wherein the bottom surface is obliquely intersected with the light incident surface. 7. The light guide plate of claim 1, wherein the bottom surface uniformly distributes a plurality of dots. The light guide plate according to claim 1, wherein the bottom surface distributes the plurality of dots, and the distribution of the dots gradually changes away from the light incident surface. 1264574 VI. The scope of application for patents is confidential. 9. The light guide plate of claim 1, wherein the bottom surface distributes a plurality of dots, and the volume of the dots gradually increases away from the light incident surface. A backlight module includes: a light guide plate including at least a light incident surface for receiving light, a light exit surface intersecting the light incident surface, and a bottom surface opposite to the light exit surface; at least one And a cold cathode fluorescent lamp light source disposed on the opposite light incident surface/side; wherein the at least one light incident surface has two sides orthogonal to the light source longitudinal direction and has a meandering structure. II. The backlight module of claim 1, wherein the length of the prism structure is equivalent to the length of the invalid light-emitting section of the cold cathode fluorescent lamp. 1 2. The backlight module of claim 1, wherein the structure of the crucible is continuous, the south of the crucible is 30 to 50 cm, and the pitch of the crucible is 50 to i cm. The angle of the apex angle of the prism is 9 〜 to 120 degrees. The backlight module of claim 1, wherein the crucible structure is discontinuous, the molar height is 30 to 50 cm, and the pitch of the crucible is 50 to 150 cm. The angle of the mirror angle is 90 degrees to 120 degrees. The backlight module of claim 1, further comprising a reflecting plate disposed adjacent to a bottom surface of the light guiding plate. The back module according to the first aspect of the invention, further comprising a reflective film attached to the bottom surface of the light guide plate. 1264574 VI. Patent Application Range 1 6. The backlight module of claim 10, wherein the bottom surface intersects the light incident surface perpendicularly. The backlight module of claim 10, wherein the bottom surface is obliquely intersected with the light incident surface. 1 8. The backlight module of claim 10, wherein the bottom surface uniformly distributes a plurality of dots. The backlight module of claim 10, wherein the bottom surface is distributed with a plurality of dots, and the distribution of the dots is gradually densified away from the light incident surface. The backlight module of claim 10, wherein the bottom surface is distributed with a plurality of dots, and the volume of the dots gradually increases toward a direction away from the light incident surface. 2 1. The backlight module of claim 10, wherein the light exiting surface is distributed with a prism structure. Page 14