TWI344041B - Light guide plate and backlight module using the same - Google Patents

Description

[0001] The present invention relates to a light guide plate and a backlight module using the same, and more particularly to a light guide plate having a dot distribution and adopting the same. The backlight module of the light guide plate. [Prior Art] [0002] Since the liquid crystal of the liquid crystal display panel itself has no illuminating property, in order to achieve the display effect, it is necessary to provide a liquid crystal display panel with a light source device, such as a backlight module, which functions to supply brightness to the liquid crystal display panel and A uniform surface light source. [0003] The backlight module of the prior art is mainly composed of a light source, a light guide plate, a reflection plate, a diffusion plate and a prism plate. The light source may be disposed on one side or two opposite sides of the light guide plate and emit light to the light guide plate. The light guide plate is configured to guide the light transmission direction so that the light is uniformly emitted from the light exit surface of the light guide plate, and the reflector is disposed opposite to the bottom surface of the light guide plate to reflect the light emitted from the bottom surface of the light guide plate into the light guide plate to improve the light. Utilization rate. The diffusing plate and the prism plate are arranged in sequence with respect to the light emitting surface of the light guiding plate, so that the light emitted from the light guiding plate is more evenly distributed, thereby improving the brightness and uniformity of the liquid crystal display panel. [0004] According to the shape of the light guide plate, it can be divided into a flat light guide plate and a wedge light guide plate. In order to increase the light extraction efficiency and uniformity of the light guide plate, a V-shaped groove or a mesh point is usually disposed on one side of the light guide plate, and the distance and size of the V-shaped groove or the mesh point distributed on the light guide plate may be different. When the light is transmitted to the V-groove or dot, the light will be reflected and scattered, and transmitted to different directions, and finally emitted by the light-emitting surface of the light guide. Use a variety of sparse, size form number A0101 Page 3 / 19 pages 1003114170-0 1344041 Correction of different V-shaped grooves or dots on April 01, 100, can make the light guide plate evenly illuminated [0005] 凊 - and refer to the first In the prior art, a backlight module 10 includes a light guide plate 12 having a light incident surface and a light exit surface, and a light source disposed on a light incident surface side of the light guide plate 丨2. A reflection sheet 13 disposed on the end surface of the light guide plate 12, a diffusion plate 16 disposed on the light exit surface of the light guide plate 12, and a reflection plate 15 disposed on the bottom surface of the light guide plate 12. In order to effectively utilize the light emitted by the light source 11, a reflector cover 17 is also disposed at the light source 11. In addition, in order to destroy the light in the light guide plate 12

The total reflection condition of the partial transmission is set to be a circular axial parallel "_cloth_column" in a matrix arrangement, and is the same as the smaller. The mesh point 14% source 11 axial ink line, and the size of the dot 14 in each row Different, wherein the diameter of the source U telSectuo! 14 is the smallest 'the distance from the source u is gradually increasing. [0006] The dots 14 of the light guide plate 12 are arranged in a parallel direction. Column, the gap between its adjacent complex dots (not shown)

The larger the area, that is, the distribution density of the dots per unit area is lower, which will result in lower uniformity of light output. Moreover, the gap is linearly arranged in each column, and is applied to the display panel, and the gaps in the alignment of each column line may generate a bright line to directly reduce the display quality. [0007] The distribution of the other side of the light guide plate 14 on the bottom surface of the light guide plate 12 can improve the light uniformity of the entire light exit surface of the light guide plate 1 to a certain extent. However, since the light guide plate 12 is adjacent to the electrode region of the lamp tube at two corners of the light source 11, the light emission brightness is extremely low. Therefore, it is difficult to achieve the light of the entire light guide plate. 094123174 Form No. A0101 Page 4 of 19 1003114170-0 The correction of the page is completely uniform and consistent. [〇〇〇8] In view of the above, it is necessary to provide a light guide plate and a backlight module using the light guide plate by improving the dot design to improve the brightness uniformity of the entire light guide plate. SUMMARY OF THE INVENTION [0009] In the following, a light guide plate with improved dot design to improve the uniformity of brightness of the entire light guide plate, and a backlight module using the light guide plate will be described in several embodiments. [0010] In order to achieve the above, a guide plate is provided, which includes a light-transmitting plate, and the light-transmitting plate includes a light-incident surface, a light-emitting surface connected to the light-incident surface,

a bottom surface opposite to the light-emitting surface; and a plurality of shapes i on the bottom surface of the light-transmitting plate, the dot is a regular hexagon, and the dot is at the four corners of the bottom surface, and is parallel to the axial direction of the light-incident surface. Close to the corner, the larger the area of a single dot, the denser the distribution. [0011] Preferably, the farther the plurality of dots are distributed from the light incident surface, the denser the area, and the larger the area of a single dot. [0012] Preferably, the light-transmitting plate comprises two opposite light-incident surfaces, and the dots in the strip-shaped region parallel to the light-incident surface are densely distributed, and the single dot area is the largest. [0013] More preferably, the above-mentioned single The entrance surface or the double-into-light surface design is located at the four corners of the bottom surface, along the axial parallel direction of the entrance surface, and the closer to the corner, the larger the area of a single dot and the denser the distribution. [0014] A backlight module is provided, comprising: a light guide plate and a light source, the light guide plate comprises: a light transmissive plate, the light transmissive plate comprises a light source form number A0101, page 5 / 19 Page 1003114170-0 1344041 100 years 04 g 01 correction replacement 茛 close to the entrance surface, a light exit surface connected to the light entrance surface, a bottom surface opposite to the light exit surface, and a plurality of dots formed on the bottom surface of the light transmission plate The dot is a regular hexagon, and the dot is at the four corners of the bottom surface, and is parallel to the axial direction of the light entrance surface. The closer to the corner, the larger the area of the single dot and the denser the distribution. [0015] Compared with the prior art, the light guide plate of the embodiment has the following advantages: each dot of the light guide plate has a regular hexagon shape, so the gap area between adjacent multiple dots is small, that is, the unit area The dot arrangement is more round

To be close, and thus to the end of the light _ _:: 'released light uniformity is higher. Further, the mesh point is more densely spaced from the light-incident surface. * The scattering ability of the light can compensate for the defect of the light intensity of the end light, and further realize the uniformity of the light-emitting trousers '''.ΖίΙ' The light guide plate having two light-incident surfaces has a large area in the light-incident surface, and the distribution of the dots in the strip-shaped region far from the light-incident surface is dense, and the scattering ability of the light is strong. rJ - λ: JT\·' The intensity of the light emitted from the middle strip is better than that of the whole light guide. Further, at the four corners of the bottom surface, along the axial parallel direction of the light entrance surface, the closer to the corner, the larger the area of the single dot is, the denser the distribution is, and the four corners of the light guide plate can be solved due to the influence of the electrodes of the lamp tube. The problem of low brightness of the light is to further improve the uniformity of the overall light output of the light guide plate. [Embodiment] The light guide plate of the present invention and the backlight module using the same will be further described in detail below with reference to the accompanying drawings and the embodiments. 094123174 Form No. A0101 1003114170-0 1344041 The following is a replacement page [0017] Please refer to the third figure. The first embodiment of the present invention provides a backlight module 20, which includes: a light guide plate ( Not shown) and a cold cathode lamp tube 21, the light guide plate includes a light transmissive plate 22 and a plurality of dots 24 . The light transmissive plate 22 includes a light incident surface 222 adjacent to the cold cathode fluorescent tube 21, a light emitting surface 224 connected to the light incident surface 222, and a bottom surface 226 opposite to the light emitting surface 224. The plurality of dots 24 are formed on the bottom surface 226 of the light-transmitting plate 22. [0018] Referring to FIG. 4, in order to improve the brightness and uniformity of the light guide plate, the plurality of dots 24 are distributed as follows: the plurality of dots 24 are arranged in a direction parallel to the axial direction of the cold cathode lamp 21. The plurality of rows; the plurality of dots 24 are arranged in a plurality of rows in a direction perpendicular to the axial direction of the cold cathode lamp 21. Adjacent odd-numbered columns and even-numbered columns are respectively offset by a certain distance and interlaced by .i .. . The number of the plurality of dots 24 is small in each row, and the diameter of the dots 24 near the cold cathode lamp 21 is the smallest, and as the distance from the cold cathode lamp 21 increases, the area of the dots 24 gradually becomes larger. [0019] Further, in order to solve the problem that the brightness of the four corners of the light-transmitting plate 22 is low due to the influence of the electrodes of the cold cathode lamp tube 21, the uniformity of the light output of the light-transmitting plate 22 is improved. At the four corners of the light plate 22, along the axial parallel direction of the light entrance surface, the closer to the corner, the larger the area of the single mesh point 24 and the denser the distribution. In this embodiment, except for the four corners of the light-transmitting plate 22, the mesh area of each column is the same. Referring to FIG. 5, the dot 24 of the present embodiment includes a general ink dot or an ink dot containing a scattering agent, which can be formed on the bottom surface 226 of the light-transmitting plate 22 by ink printing. The dot 24 of the present embodiment adopts a honeycomb-shaped regular hexagonal design. The plurality of dots 24 are arranged in a matrix, along the axis perpendicular to the axial direction of the cold cathode lamp 21, adjacent to the odd column and the even column 094123174. Form No. A0101 Page 7 / 19 pages 1003114170-0 1344041 100 April 01. Correction Replacement 肓 点 24 24 24 24 24 24 24 24 24 24 24 24 pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch pitch The value range of the distance between the centers of adjacent dots 24 in the same column is: 0· 5477 < Y . u < 2. 739 (unit: mm). The width of the hexagonal side of the dot 24 pitch is from 0.123 to 4.81 mm, and the area of the dot 24 is from 0. 0398 to 60. 075 mm 2 . The dot 24 has a thickness in the range of 5 to 20 microns. [0022] [0022]

The mesh point 24 of the embodiment adopts a regular hexagonal design with better optical energy utilization rate, and the gap area of the adjacent complex network is small, that is, the light per unit area has a good light scattering effect, and the 4 light output is self-layered. The |^^ meter can effectively provide the most angled phenomenon of each. In the third embodiment, in order to further improve the brightness uniformity and the light utilization rate, the backlight module of the embodiment includes: a diffusion sheet 25 disposed on the light-transmitting plate 22 in turn, a light collecting sheet 26 and an upper diffusing sheet, a reflecting sheet 28 of the bottom surface 226 of the light transmitting plate 22, and a reflector 29 surrounding the light source 21. [0023] Please refer to the sixth drawing, the second embodiment of the present invention A backlight module 30 is provided. The backlight module 30 includes a light guide plate (not shown) and a plurality of cold cathode lamps 3i, 31. The light guide plate includes: a light transmissive plate 32 and a plurality of dots 34. The light-transmitting plate 32 includes two opposite light-incident surfaces 322 and 322, a light-emitting surface 324 connected to the two light-incident surfaces 322 and 322, and a bottom surface 326 opposite to the light-emitting surface 324. The plurality of dots 34 are formed on the bottom surface 326 of the light-transmitting plate 32. Each of the two cold cathode lamps 31, 31 / are respectively adjacent to the two entrance surfaces 094123174 Form No. A0101 Page 8 / Total 19 pages 1003114170-0 1344041 100 years after April οι are replacing pages 322, 322 322, 322 The light emitted from the cold cathode lamps 31, 31 enters the light transmissive plate 32 by the two human faces 322, 322', respectively. The two reflectors 39 respectively surround and enclose the two pairs of cold cathode lamps 31, 31 - ^ the lower diffusion sheet 35' - the light collecting sheet 36 and the upper diffusion sheet 37 are sequentially disposed above the light emitting surface m of the light transmitting plate 32. The reflective sheet 38 is disposed below the bottom surface of the light transmissive plate 32. [0024] Referring to the seventh figure, the plurality of dots 34 are distributed as follows: the plurality of dots 34 are arranged in a matrix, and are parallel to the light incident surfaces 322, 322> and adjacent to the odd columns and the even columns are respectively shifted. Interlaced with spacing. The dots 34 in the strip-shaped region parallel to the entrance faces 322, 322 are denser than those at other locations, and the area of the single dots 34 is larger than the area of the dots 34 on the other sides. In the strip-shaped area, the distribution of the dots 34 is maximized by the dots 34 at the ends of the strips, and the area of the single dots 34 is also the largest. Moreover, in the four corners of the light-transmitting plate 32, the direction of the axial direction of the light-incident surface is parallel, and the closer to the corner, the larger the area of the single dot 34 and the denser the distribution. [0025] In the present embodiment, the light-transmitting plate 32 is a 17-inch flat plate, and the plurality of dots 34 are regular hexagons. The vertical distance between the centers of adjacent complex dots 34 satisfies the following condition: Xpitch..Ypitch=(3)0·5:(3/2), where

Xpi tch represents the distance between the centers of adjacent dots 34 of adjacent odd and even columns; YpitCh represents the distance between the centers of adjacent dots 34 of the same column. The length L of the side of the dot 34 is in the range of 0.6196 to 0.9617 mm, and the area of the dot is 0. 9974~2. 403 mm 2 . [0026] The light-transmitting plate 32 of the embodiment has no dot 34 provided on the bottom surface 326 thereof. The intensity of the light is derived from the light strip 3 2 2, 3 2 2 " the middle strip area 094123174 Form No. A0101 Page 9 / Total 9 pages 1003114170-0 1344041

On April 1, 100, the nuclear replacement 1S domain was the weakest, and the light-incident surface 322 ' 322 / adjacent to the light-transmitting plate 32 was stronger. Therefore, when the dot 34 distributed according to the embodiment is disposed on the bottom surface 326 of the light-transmitting plate 32, the overall light output of the light guide plate can be achieved due to the year-on-year relationship between the size and/or the distribution density of the dot 34 and the light-extracting intensity. degree. [0027] In addition, the light guide plate of the backlight module 30 of the embodiment includes two sides except the two light incident surfaces 322 and 322. The backlight module 30 may further include two reflective sheets (not shown) respectively disposed on the light guide plate. The two sides are adjacent to prevent light from exiting from both sides of the light guide plate. Of course, it is also possible to use a charge directly on the two sides of the highly reflective film. It is understood that the present side - ester, polycarbonate::, polyethylene resin 1 light plate is not limited to a flat shape, limited to Relatively set two cold cathode lamps, but also a single light-emitting diode point source, multiple illumination.

Acrylic tree, the guide of invention, the light source is not cold cathode lamp, the body point source

Elleciua! [0029] It can be understood that the design of the light guide plate at the four corners of the light guide plate of the present invention is increased: the light guide plate of the needle has a dot distribution: the size of the dots of each column is the same, and the plurality of dots in each row The size is different, and the farther the plurality of dots are distributed from the light entrance surface, the denser the area is, and the larger the area of a single dot is. For the light guide plate with double-into-light surface, the distribution of the dots is as follows: The dots of each column are the same: the dots in the strip-shaped area parallel to the entrance surface are denser than the other points, and the area of the single dot is compared with other The edge of the outlet has a large area.

[0030] Each dot of the light guide plate of the present invention has a regular hexagon shape, so the adjacent plural number 094123174 form number A0101 笫 10 pages / total 19 pages 1003114170-0 1344041 100 years April 01 nuclear replacement page dot between The gap area is small, that is, the arrangement of the dots per unit area is tighter than the circular shape, so that the scattering effect on light is better, and thus the uniformity of light emission is higher. Further, the present invention has only a single light-introducing light guide plate, and the farther the mesh point is from the light-incident surface, the denser the distribution, the larger the area of a single dot, the stronger the scattering ability to light, and the light-guiding plate can be compensated for away from the light-incident surface. The defect of the light intensity at one end is further weakened, and the uniformity of the overall light output of the light guide plate is further realized; the light guide plate having the two light entrance surfaces is densely distributed in the stripe region parallel to the middle of the light incident surface, and the single dot is The large area and strong scattering ability to light can compensate for the weak light intensity of the light strip in the middle strip region away from the light incident surface, and further realize the uniformity of the overall light output of the light guide plate. Further, at the four corners of the bottom surface, along the axial parallel direction of the light entrance surface, the closer to the corner, the larger the area of the single dot is, the denser the distribution is, and the four corners of the light guide plate can be solved due to the influence of the electrodes of the lamp tube. The problem of low brightness of the light is to further improve the uniformity of the overall light output of the light guide plate. [0031] In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS [0032] The first figure is a side view of a prior art backlight module. [0033] The second figure is a distribution diagram of the dot of the backlight module of the first figure on the bottom surface of the light guide plate. [0034] The third figure is a side view of the backlight module of the first embodiment of the present invention. 094123174 Form No. A0101 Page 11 of 19 1003114170-0 1344041

[0037] [0038] [0040] [0044] [0044] [004] [0048] [0049] [0049] "n/rai ^ WWW%# J 094123174 On April 01, 100, the shuttle is replacing the first fourth figure. The distribution map of the light guide plate of the backlight module of the third figure is the enlarged view of the partial V of the fourth figure. A side view of the backlight module of the second embodiment of the present invention. The seventh figure is a schematic diagram of the distribution of the light guide plate dots of the backlight module of the sixth figure. [Main component symbol description] Backlight module: 20, 30 Cold cathode lamp: 21, 31 ' 31 Translucent plate: 22, 32 ... 0 Dot: 24, r Lower diffuser: 2 & 35 Collector: 26, 36 Upper diffuser: 27 ' 37 Reflector: 28, 38 Reflector: 29 , 39 into the light surface: 222, 322, 322 light surface: 224, 324 bottom surface: 226, 32fi form number A0101:. offer, machine j.::": do: * ϋϋϋ_.1ΒΟ m

Intellectual Page 12 of 19 ΠΡΓΤν t 1003114170-0

Claims (1)

On April 01, 100, the patent application is as follows: A light guide plate includes a light-transmitting plate, and the light-transmitting plate includes a light-incident surface, a light-emitting surface connected to the light-incident surface, and a light-emitting surface. a bottom surface opposite to the bottom surface; and a plurality of dots formed on the bottom surface of the light-transmitting plate, wherein the dot is a regular hexagon, and the dot is at the four corners of the bottom surface, and is closer to the corner along the axial parallel direction of the light-incident surface. The larger the area of a single dot, the denser the distribution. The light guide plate according to claim 1, wherein the farther the plurality of dots are distributed from the light incident surface, the larger the area of the single dot is. The light guide plate of claim 1, wherein the light-transmitting plate comprises two opposite light-incident surfaces, and the dots in the strip-shaped region parallel to the two opposite light-incident surfaces are densely distributed. The size of a single dot is the largest. The light guide plate according to claim 1, wherein the plurality of dots are arranged in a matrix, and are arranged in a direction parallel to an axial direction of the light incident surface, and are perpendicular to an axial direction of the light incident surface. And the distance between the centers of adjacent dots of the adjacent columns is greater than 0.5477 mm and less than 2.739 mm. The distance between the centers of the adjacent dots of the adjacent columns is greater than 0.7746 mm and less than 3.873 mm. . The singularity of the side of the dot is 0. 123~4. 81 mm. The light guide plate of claim 1, wherein the area of the dots is 0,0398 to 60.075 square millimeters. The light guide plate of claim 1, wherein the dot has a thickness of 5 to 20 μm. A backlight module includes: a light guide plate and a light source, the light guide plate includes a light transmissive plate, and the light transmissive plate includes a light incident surface adjacent to the light source. Form No. A0101 Page 13 / Total 9 pages 10. The repair of the light-emitting surface connected to the smooth surface, the bottom surface opposite to the light-emitting surface, and the plurality of dots formed on the bottom surface of the light-transmitting plate, the improvement is that the dot is a regular hexagon. And the mesh point is at the four corners of the bottom surface, along the axial parallel direction of the light entrance surface, the closer to the corner, the larger the area of the single dot and the denser the distribution. The backlight module of claim 9, wherein the plurality of dots are distributed more densely from the light incident surface, and the area of the single dot is larger. The backlight module of claim 9, wherein the light-transmitting plate comprises two opposite light-incident surfaces, and the dot distribution in a strip-shaped region parallel to the two opposite light-incident surfaces is For example, if the 12 g dot area is the largest, the patent application scope is the first, the net point is in the parallel direction of the net window of the four corners of the _ face, and the closer to the corner, the area of the Li dot is as expected in the 11th article of the patent application; The month element "Mo group includes two light sources, which are respectively adjacent to the two input 丨 _ sounds, so that the light emitted by the two light sources enters the light transmissive plate from the two entrance surfaces::. 13 14 . As claimed in claim 13, the backlight module includes two reflectors swaying the two light sources. As described in claim 9 of the scope of claim 5, and wherein The backlight module includes a lower diffusion sheet, a light collecting sheet and an upper diffusion sheet disposed one above the light emitting surface of the light transmitting plate. The backlight module of claim 9, wherein the 'yuan chess set π is a reflective sheet disposed under the bottom surface of the light transmission. The backlight module of claim 9, wherein the light-transmissive plate comprises two sides, and the backlight module comprises two reflective sheets respectively disposed adjacent to the two sides. 094123174 The backlight module of claim 9, wherein the form is edited by the form, and the 1003114170-0 17 1344041, . 100 years old, April 01, the replacement page The light transmissive plate comprises two sides, and the backlight module comprises a high reflection film formed on the two sides. The backlight module of claim 9, wherein the light source comprises at least one cold cathode lamp, or at least one light emitting diode. 094123174 Form No. A0101 Page 15 of 19 1003114170-0