TWI359995B - Back light module to fulfill a stereoscopic displa - Google Patents

Description

逹撝 : : TW TW TW 发明 发明 TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光Its light guide plate. [Prior Art] With the advancement of signal processing and display technology, stereoscopic images have been displayed by flat panel displays. The imaging principle of the stereoscopic image is mainly to generate images for the left eye and the right eye, and to allow the viewer's left and right eyes to see only the corresponding images. Since the two images have slight angular differences', it is equivalent to the viewer viewing the same object at different angles in the left and right eyes respectively, so the viewer's brain will receive the ^ signal mixed in the left and right eyes' so that the viewer sees An image of a three-dimensional depth of field. Please refer to Fig. 1 for a schematic diagram showing the imaging principle of a conventional stereoscopic image display. The multiple halogen 10 is formed by a plurality of halogen L and a plurality of halogen R (four) columns, wherein the pixel L produces an image for viewing by the left eye, and the pixel R generates an image for viewing by the right eye, and two pixels are generated. The image has some slight angular differences. And each of the halogens [and the halogens R correspond to the polarization unit ρι and the polarization unit p2 on the polarization element 12, respectively. The polarization units P1 and P2 have mutually perpendicular polarization directions. The image light emitted by the element l passes through the polarization unit P1 and becomes polarized light having a polarization angle D1. Similarly, the image light emitted by the pixel R passes through the polarization unit and becomes a polarization having a rake angle D2. Light. When these two are polarized 1359995

Sanda number: TW2397PA

When the image light is projected onto the polarizing film corresponding to the polarization angle thereof, for example, the polarizing film F1 having the polarizing film F1 and the polarizing film F2, the image light of the pixel L having the polarization angle D1 can pass through the polarizing film iq and cannot pass through the polarizing film F2. Similarly, the image light of the pixel with the polarization angle D2 can pass through the polarizing film F2 and cannot pass through the polarizing film F1. Therefore, when the viewer wears the polarizing glasses 14, the left and right eyes can respectively receive the alizarin [and the image light generated by the pixel R" so that the stereoscopic image can be seen. However, in this embodiment, the user is required to wear the polarizing glasses 14, which causes inconvenience in use. Further, when the image light passes through the polarizing element 12, part of the light is inevitably filtered out, resulting in a decrease in brightness. The pixels on the multiple halogen 1G must be accurately aligned with the polarization units on the polarized 7L member 12 to produce the correct polarization, which greatly increases the difficulty in the process. Please refer to 帛2, which is a schematic diagram of the imaging principle of the #-social image display. The display panel 22 has a backlight module 20. As shown in Fig. 2, the display panel 22 has alternating elements of alizarin L and alizarin R, and has different polarization directions corresponding to the hairpin image. When the image light generated by the halogen L and the halogen R is projected onto the grating 24, since the structures of the gratings 24 having different polarization directions are alternately arranged, the image light of the pixel R is filtered out, so that the image light of the pixel L is transmitted. The left eye; the same reason. The grid can be used to capture the image light of the element L, so that the pixel R light can convey the money of the viewer. Therefore, the left and right eyes of the viewer can independently receive the image light generated by the pixel L and the pixel R, so that the stereo image can be obtained. However, in the present embodiment, (4): splitting light ray reduces the brightness by about %. In the LCD panel, the following: 1359995 m

No.: TW2397PA ♦ The unit that produces polarization' plus the grating 24 will result in a significant increase in the weight of the overall liquid crystal display. [Invention] In view of the above, an object of the present invention is to provide a backlight module of a display and a light guide plate thereof. The user does not need to purchase additional gratings attached to the display' or must additionally wear polarized glasses, so that the user can directly view the display with stereoscopic imaging function. _ According to the purpose of the present invention, a backlight module is proposed. The light module) includes at least one light guide and one side light source group. The light guide plate has a light reflecting surface, a light emitting surface, a plurality of first grooves and a plurality of second grooves. The light exit surface is opposite to the light reflecting surface, and the plurality of first grooves and the plurality of second grooves are formed on the light reflecting surface. The side light source group includes at least a first side light source and a second side light source ' disposed at opposite positions of the light guide plate for emitting light in the light guide plate. When the radiant light emitted by the side light source group is transmitted in the light guide plate, the first groove and the second groove respectively reflect the light emitted by the first side light source and the second side light source to emit light toward the light exit surface. Another object of the invention is to provide a light guide plate for use with a side light source set. The side light source group includes at least one side light source and a second side light source respectively disposed at opposite positions of the light guide plate for transmitting light in the light guide plate. The light guide plate has a light reflecting surface, a light emitting surface, a plurality of first grooves and a plurality of second grooves. The light exit surface is opposite to the light reflecting surface, and the plurality of first grooves and the plurality of second grooves are formed on the light reflecting surface. The light source group includes at least a first side light source and a second side light source.

Sanda number: TW2397PA 4 is placed in the opposite position of the light guide plate to emit light in the light guide plate. When the light emitted by the side light source group is transmitted in the light guide plate, the first groove and the second groove are respectively used to reflect the first side light source and the second side light source. Light is emitted toward the light exit surface. The above described objects, features, and advantages of the present invention will become more apparent. The following detailed description of the preferred embodiments, together with the accompanying drawings, will be described in detail as follows: 3A is a side view of a display backlight module according to Embodiment 1 of the present invention. The backlight module 100 includes a side light source group 110, a light guide plate 120', and preferably a prism sheet 140. The side light source, the group 110 includes a first side light source and a second side light source, for example, the side light source 112 and the side light source 114, respectively located on the left and right sides of the light guide plate 120, and alternately emit light to the light guide plate 120. Pass in. The light guide plate 120 has a light reflecting surface 160 and a light emitting surface 130, and a plurality of first grooves and a plurality of second grooves are formed on the light reflecting surface 160. The first groove is, for example, a groove 124. The two grooves are, for example, grooves 128. Each of the recesses 124 has a reflective surface 121 and a non-reflective surface 123. The reflective surface 121 intersects the non-reflective surface 123 at the intersection line 122. Each recess 128 has a reflective surface 125 and a non-reflective surface 127, and the reflective surface 125 The non-reflective surface 127 meets at intersection 126. The reflective surface 121 is opposite to the side light source 112 for reflecting the light emitted by the side light source 112 to the light exit surface 130. The reflective surface 125 is opposite to the side light source 114 for reflecting the side light.

The three-state number: TW2397PA r The light emitted by the source 114 is emitted toward the light exit surface 130. Further, the normal plane n1 and the normal plane n2 are defined to pass through the intersection line 122 and the intersection line Π6, respectively, and are perpendicular to the light reflecting surface 160. The reflecting surface 121 and the non-reflecting surface 123 respectively intersect the normal plane n1, and the angle 01 and the angle Θ2 are formed. In order for the reflective surface 121 to reflect the light from the side light source 112 toward the light exit surface 130, and the non-reflecting surface 123 is not able to reflect the light from the side light source 114 toward the light exit surface 130, the angle Θ1 is designed to be not equal to the angle. Θ 2. The reflecting surface 125 and the non-reflecting surface 127 are separated from each other by the normal plane n2 to form an angle 03 and an angle 04. The angle 0 1 and the angle 02 are the same as the above, and the angle 03 is designed to be not equal to the angle 0 4 . Wherein the angles 01, the angles 02, the angles 03, and the angles 04 are all sharp angles, that is, the angles range from 0° to 90°, but not equal to 0° or 90°. In this embodiment, in order to allow the light guide plate 120 to uniformly reflect the light emitted by the two side light sources, it is preferable to make 0 1 equal to 03 and 02 equal to 04, so that the groove 124 and the groove 128 are mirror-symmetrical structures. Please refer to FIG. 3B, which shows a plan view of the light guide plate and the side light source group in FIG. 3A. In the present embodiment, the recess 124 and the recess 128 are parallel to the side light source 112/114 and alternately arranged along the line connecting the side source U2 and the side source 114. The groove 124 and the groove 128 are distributed in a strip shape on the light guide plate 120 and are mirror-symmetrical to the central axis of the light guide plate 120. Further, because the closer to the groove in the center of the light guide plate 120, the light intensity of the side light source is reduced, so the intensity of the reflected light is also smaller, which may cause the brightness of the light emitted from the central portion to decrease. Therefore, in this embodiment, each groove 124 and each groove 128 are arranged along the line connecting the side light source 112 and the side light source 114.

The separation distance of the three-dimensional number: TW2397PA is reduced as the distance between each groove 124 and each groove 128 and the side light source group 110 increases. As shown in Fig. 3B, the first group of grooves arranged from the left side is the groove 124, and the lower group is the groove 128. The distance between the intersection line 122 of the two sets of grooves and the intersection line 126 is dl. Next, the next set is the groove 125' whose distance between the intersection line 122 and the line 126 of the previous set of grooves is d2. The two grooves are alternately arranged, and the distance relationship between the grooves is dl > d2 >~> dn. Similarly, the first set of grooves arranged on the right side is 128 and alternately arranged in mirror symmetry with the left side. The mirror symmetrical arrangement on the left and right sides allows the light source on both sides to reflect and equalize the intensity. The distance between the two sets of grooves, which is gradually reduced by the distance between the grooves from the light sources on both sides, can increase the light output intensity of the ten central portion, so that the light intensity of the entire light guide plate 120 is more uniform. In the present embodiment, a cymbal sheet 140 is more preferably added in order to improve the utilization efficiency of light extraction. Please refer to FIG. 3C, which is a partial enlarged view of a prism sheet applied to the backlight module in FIG. 3A. The cymbal sheet 140a' has a light incident surface and a second light exit surface ′ such as a light incident surface 144a and a light exit surface 142a. A plurality of convex surfaces 146a' are formed on the light exit surface 142a. Each convex surface 146a has a radius of curvature r, and a plurality of facets 148a are formed on the light incident surface 144a. The cymbal sheet 4040 having such a structure can allow the light emitted from the light guide plate 120 to pass through the prism sheet 140a, and can be more concentrated toward the angle of the corresponding viewer, thereby improving the light-emitting efficiency. Referring again to FIG. 3D, a partial enlarged view of another prism lens applied to the backlight module of FIG. 3A is shown. The cymbal sheet 140b differs from the cymbal sheet 140a in Fig. 3C in the configuration of the light exit surface 142b. Light exit surface 142b 1359995

The convex surface 146b of the Santada number: TW2397PA is a quarter arc surface, but its radius of curvature is the same as the convex surface 146a of the light exit surface 142a in Fig. 3C. By determining the magnitude of the convex curvature r, it is possible to control the light to be refracted through the light exit surface 142a or 142b in a particular direction, such as the direction of the viewer's eye. In addition, the convex surface 146b of the surface of the light exit surface 142b is mirror-symmetrical with respect to the central axis (/), which makes the probability of light from different side light sources reaching the eyes of the viewer more uniform. Hereinafter, the backlight module 100 of the embodiment is used as a stereoscopic display. Referring to FIG. 3A and FIG. 4 simultaneously, when the side light source 112 on the left side of the light guide plate 120 emits light, the corresponding pixel also produces an image. Most of the light emitted by the side light source 112 is reflected by the reflective surface 121 and then passes through the light exit surface 130 to the eye corresponding to the viewer, such as the right eye. Then, the side light source 1 Π is turned off, and the side light source 114 is turned on, and another corresponding pixel generates an image. Most of the light emitted by the side light source 114 is reflected by the reflective surface 125 and passes through the light exit surface 130 to the eye corresponding to the viewer, such as the left eye. If the time interval of the alternate illumination of the side light sources 112, 114 is short, the illusion that the two images are seen by the left and right eyes at the same time can be generated by the viewer, so that the viewer can produce the effect of viewing the stereoscopic image. As shown in FIG. 4, it shows a schematic diagram of the function of the backlight module of the present invention applied to a stereoscopic display. The display includes the backlight module 100 and display panel 150 of the present invention. The display panel 150 has an alizarin L and an alizarin R alternately arranged. The pixel L and the halogen R are combined with the backlight module 100 to alternately emit image light in a very short period of time, and independently transmit the image light of the pixel L and the pixel R to the left and right eyes of the viewer. Make the viewer see 12 1359995

Sanda number: TW2397PA 4 stereo image. Embodiment 2 Referring to Figure 5, there is shown a plan view of a light guide plate and a side light source group according to a second embodiment of the present invention. The main difference between this embodiment and the first embodiment is the arrangement direction of the grooves and the arrangement of the side light source groups. One side 250 of the light guide plate 220 intersects with the extension of the intersection line 222 and the intersection line 226 at an angle φ, and the angle p is an acute angle, that is, the angle range is greater than 0° and less than • 90. . In the present embodiment, the grooves (not shown) having the intersection line 222 and the grooves (not shown) having the intersection line 226 are alternately arranged and mirror-symmetrical with respect to the diagonal axis 0. The two grooves are alternately arranged, and the distance relationship between the grooves is dl > d2 > ... > dn. The side light source 212 and the side light source 214 are respectively disposed corresponding to the grooves (not shown) having the intersection line 222 and the grooves (not shown) of the intersection line 226, and respectively reflect the image light to the eyes corresponding to the viewer. The rest of the configuration and functions of the embodiment are the same as those of the first embodiment, and will not be described again. Embodiment 3 Referring to Figure 6, a plan view of a light guide plate and a side light source group according to a third embodiment of the present invention is shown. The main difference between this embodiment and the first and second embodiments lies in the arrangement of the grooves and the form of the side light source group. The light guide plate 320 of this embodiment has a plurality of grooves R1 and a plurality of grooves R2. The groove R1 and the groove R2 are alternately arranged along the line connecting the side light source 312 and the side light source 314. In addition, the distance dl between the grooves arranged along the line connecting the side light source 312 and the side light source 314 is d1 >d> dn, which increases with the distance from the side light source 13 1359995 Λ

Sanda number: TW2397PA Decrement. The grooves R1 and R2 are alternately arranged in the direction of the parallel side light sources 312/314, so that the grooves R1 and R2 are distributed in a dot shape on the light guide plate 320. In the groove arrangement of the embodiment, the light guide plate 32 can more uniformly reflect the light generated by the side light sources 312 and 314 to achieve a better stereoscopic imaging effect. In addition, the side light source group of the embodiment replaces the line light source with a plurality of continuous point light sources, thereby achieving a better light-emitting effect. The rest of the construction and function are the same as those in the first embodiment and will not be described again. However, the technical field to which the present invention pertains is generally known to those skilled in the art, and the present invention is not limited to the above embodiments. For example, the light guide plate preferably employs a material having a refractive index at least greater than 丨, such as an acryl. The grooves may be arranged in different directions, and the intersection of the grooves may extend to intersect with either side of the light guide plate. 〜9〇, a strip-shaped groove is formed on the light guide plate, and may be a single groove or a plurality of grooves formed in a dot-like arrangement. Each side light source can be a single light source or a combination of multiple light sources. φ The backlight module and the light guide plate disclosed in the above embodiments of the present invention are the grooves formed by the light guide plate, and reflect the light emitted by the corresponding side light source. The two elements are alternately generated to produce images for the left and right eyes, so that the viewer can produce the effect of seeing the stereoscopic image. Users do not need to purchase additional light, attached to the display, can reduce the weight of the display, and can maintain a more versatile. Users do not need to wear polarized glasses separately, which reduces the inconvenience of use; the display element does not have to be accurately aligned with the polarizing mode, which reduces manufacturing difficulties and reduces production costs. In summary, although the present invention has been disclosed above in a preferred embodiment, 1359995

The three-way number: TW2397PA is not intended to limit the present invention. Any one skilled in the art can make various changes and retouchings without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention is attached. The scope of the patent application is defined as 15 359995.

Sanda number: TW2397PA [Simple description of the drawing] Figure 1 shows the conventional imaging principle of a stereoscopic image display, and the second is a schematic view of the imaging principle of another stereoscopic image display. FIG. 3A is a side view of a display backlight module according to Embodiment 1 of the present invention. FIG. 3B is a plan view showing a light guide plate and a side light source group in FIG. 3A. FIG. 3C is a partially enlarged view showing a prism sheet applied to the backlight module in FIG. 3A; FIG. 3D is a pictorial application diagram. FIG. 4 is a partial enlarged view of the backlight module of the backlight module in FIG. 3A; FIG. 4 is a schematic view showing the function of the backlight module of the present invention applied to the stereoscopic display; A plan view of a light guide plate and a side light source group; and a sixth plan view of a light guide plate and a side light source group according to Embodiment 3 of the present invention. 1359995

Sanda number: TW2397PA [Description of main component symbols] 10: Multi-pixel 12: Polarizing element 14: Polarized glasses 20, 100: Backlight module 22, 150: Display panel 24: Grating 110: Side light source group • 112, 114, 212, 214, 312, 314: side light sources 120, 220, 320: light guide plates 121, 125: reflective surfaces 122, 126, 222, 226: intersection lines 123, 127: non-reflective surfaces 124, 128, Rl, R2: concave Slot 130: Light exit surface 140, 140a, 140b: 稜鏡 142a, 142b: first exit surface 144a, 144b: light incident surface 160: light reflecting surface 250: side surface F1, F2: polarizing film L·, R: halogen PI , P2: polarization unit 17

Claims (1)

1359995 2011/11/24_3"*Recovery &correction f** 丨丨1 - I a' Ten, patent application scope: A5 beer Μ月叶 g revision 1 · A backlight module (back light module), at least The method includes: a 导ight guide having: a light reflecting surface; a light emitting surface opposite to the light reflecting surface; and a plurality of first grooves and a plurality of second grooves formed on the light reflecting The first groove is different from the second grooves, and each of the first grooves and each of the second grooves respectively has a first reflective surface and a second reflection Each of the first recesses and each of the second recesses further has a first non-reflecting surface and a first non-reflecting surface, wherein the first reflecting surface and the first non-reflecting surface The face intersection forms a first intersection line, and the second reflection surface and the second non-reflection surface intersect to form a second intersection line, wherein the first reflection surface and the third reflection surface respectively reflect the first side light source and The light emitted by the second side light source is emitted toward the light exit surface, wherein a first normal plane is defined And a second normal plane, the first normal plane and the second normal plane respectively pass the first intersection line and the f two intersection lines, and perpendicular to the light reflecting surface, the first reflecting surface and the first non- The reflecting surfaces respectively intersect with the first normal plane to form a first angle and a first angle, and the second reflecting surface and the second non-reflecting surface respectively intersect with the second plane to form a third angle and a fourth angle The first 2 series is not equal to the second angle, and the third angle is not equal to the angle; and the side light source group includes at least a first side light source and a second side light, and the light is disposed on the light guide plate. The relative position for emitting light 18 1359995 2011/11/24_3"*request & correction is transmitted in the light panel, wherein the first recess and the second recess are along the first side light source Arranging alternately with the line connecting the second side light source, or alternately arranged in a direction parallel to the arrangement of the first side light sources, or parallel to the direction of the second side light source arrangement, so that the first grooves and the second portions The grooves are distributed in a dot shape on the light guide plate. 2. The backlight module of claim 1, wherein a long side of the first recess corresponds to the first side light source, and a long side of the second recess corresponds to the second side light source. 3. The backlight module of claim 1, wherein the first angle is equal to the third angle, and the second angle is equal to the fourth angle. 4. The backlight module of claim 1, wherein one side of the light guide plate intersects with an extension of the first line of intersection/the second line of intersection, the angle of which is 〇. ~9〇. . 5. The backlight module of claim 1, wherein the first angle, the second angle, the third angle, and the fourth angle are acute angles. 6. The backlight module of claim 1, wherein the first side light source and the second side light source are alternately illuminated. The backlight module of claim 1, wherein each of the first recesses and each of the second recesses are spaced apart from each other along a line connecting the first side light source and the second side light source And the backlight of each of the first recesses and each of the second recesses and the side light source group is increased by 〇8. The backlight module of claim 1, wherein a prism is further included The sheet is disposed on the light guide plate for correcting the direction of the light corrected by the light guide plate, and the light piece has: a light incident surface having a plurality of edges a second light exit surface having a plurality of convex surfaces; wherein light rays are incident from the light incident surface, and when the light passes through the convex surfaces, the curvature of the convex surfaces controls the light from the second light exit surface to be specific Direction shot. 9. The backlight module of claim 1 is characterized in that the light guide material has a refractive index of at least greater than one. 10. A light guide plate is used in combination with a light source group. The side light source group includes at least a first side light source and a second side light source respectively disposed at opposite positions of the light guide plate for emitting light. Transmitting in the light guide plate, the light guide plate has a light reflecting surface; a light exit surface opposite to the light reflecting surface; and a plurality of first grooves and a plurality of second grooves formed on the light reflection The first groove and the second groove are different from each other, and each of the first grooves and each of the second grooves respectively have a first reflective surface and a second reflective surface. Each of the first grooves and each of the second grooves respectively have a first non-reflecting surface and a second non-reflecting surface, and wherein the first reflecting surface meets the first non-reflecting surface Forming a first = line, the second reflecting surface and the second non-reflecting surface intersect to form a second intersection line. The first reflecting surface and the second reflecting surface respectively for reflecting the first side light source and the first The light emitted by the two side light sources is emitted toward the light exit surface, which defines a first normal plane. With a second normal plane, the 20 1359995 goods $ τ 20 丨丨 dirty two 交 intersect with the first normal plane; form - the second - second: the angle 'the second reflective surface and the second non-reflective surface The first-normal plane intersection forms a third angle and a ... the angle system is not equal to the second corner angle, and the third angle is not equal to the third angle, wherein the light emitted by the side light source group Passing in the light guide plate, wherein the first groove and the second groove are alternately arranged along the line connecting the first side light source and the second side light source, and further parallel to the first side The direction of the source arrangement, or the direction parallel to the arrangement of the second side light sources, is alternately arranged such that the first grooves and the second grooves are distributed in a dot shape. 11. The light guide of claim 1, wherein the first angle is equal to the third angle, and the second angle is equal to the fourth angle. 12. The light guide plate of claim 1, wherein one side of the light guide plate intersects with the extension of the first line of intersection/the second line of intersection at an angle ‘the angle of the included angle is 〇. ~90. . 13. The light guide plate of claim 10, wherein the first angle, the second angle, the third angle, and the fourth angle are acute angles. 14. The light guide of claim 1, wherein the first side light source and the second side light source are alternately illuminated. 1 5. The light guide plate of claim 10, wherein each of the first recesses and each of the second recesses along the first side light source and the second 21 1359995 2011/11/24, 3 °1 Shen Fu & Correct the distance between the line arrangement of the side light sources, which is reduced by the distance between each of the first grooves and each of the second grooves and the side light source group. 〇16. The light guide plate of claim 10, further comprising a cymbal for correcting the optical path of the incident light, the cymbal having: a light incident surface having a plurality of facets; and a second light exit face And having a plurality of convex surfaces; wherein light is incident from the light incident surface and is emitted from the second light exit surface. twenty two