Device and method for manufacturing 2D / 3D combined LED display system

Abstract

Systems and methods of fabricating an array of multi-polarization light emitting packages (MLEPs) are provided, wherein each MLEPs includes a first left partition, a second left partition, a first right partition, and a second right partition; each partition of the MLEPs comprises at least a first light emitting element and a polarization element; the MLEPs are positioned and oriented in the array such that the viewer perceives the image displayed by the array as a three-dimensional image when viewing the array through glasses with corresponding polarized lenses. The partitions of the MLEPs are spaced apart from each other by a distance, and each polarizing element is separated from the other polarizing elements by an opaque partition wall.

Description

Technical Field

[0001] The present invention generally relates to stereoscopic display systems. Background Art

[0002] Stereoscopic display systems attempt to recreate the real-world visual experience, where the viewer sees a different view or image in each eye. In the real-world viewing experience, the viewer's two eyes see two slightly different images because each eye is in a slightly different, spaced-apart viewing position. The goal of a stereoscopic video display system is to present a separate and distinct view to each eye of the viewer.

[0003] Early attempts to recreate a real-world visual 3D experience used a device similar to corrective glasses, which included a first lens of a first color and a second lens of a second color. A monitor or projector projects the two views onto a screen, where each view is color-coded to complement one lens or the other. However, using color to isolate visual channels often causes headaches for viewers.

[0004] Recent 3D designs have focused on creating a 3D viewing experience in a traditional cinema environment using devices centered around a display screen on a lenticular screen made of fabric. However, limited progress has been made in stereoscopic vision outside of a cinema environment, including on billboards and other public media / advertising communication devices. US10298919 to Li teaches a "polarized stereoscopic electronic large screen display system" having "...two separate pixels, each of which includes three primary colors within a physical pixel for emitting light to the left eye and the right eye, respectively" (Li, Abstract). In fact, Li's "display pixel" means "a physical pixel, each of which includes two separate electronic pixels, i.e., two separate electronic pixels are inserted into each display pixel." (Li, col. 4, lines 19-22). The LEDs described by Li require two pixels to process and display, while some standard single-LED arrangements can only produce one pixel. That is, Li's system requires a customized controller to process the received image content, a customized content processing device, and a customized LED to process two pixels simultaneously. Generally speaking, it is best to use a wider range of equipment, billboards, LED cinema screens, stadium stands and / or other large display equipment to provide a 3D viewing experience. Therefore, despite the great progress made in the field of stereoscopic display systems, there are still many shortcomings. Summary of the invention

[0005] One aspect of the present design provides a stereoscopic display system, which includes: an array of multi-polarization light emitting packages (MLEPs), wherein: each MLEP includes a first left partition, a second left partition, a first right partition, and a second right partition; and each partition of the MLEPs includes at least a first light emitting element and a polarization element; and the MLEPs are positioned and oriented in the array so that when the array is viewed through glasses with corresponding polarized lenses, the viewer perceives the image displayed by the array as a three-dimensional image.

[0006] Another embodiment of the present design provides a method for manufacturing a stereoscopic display system having an array of multi-polarization light emitting packages (MLEPs), including: providing a first left partition, a second left partition, a first right partition, and a second right partition in each MLEP; providing at least a first light emitting element and a polarization element in each partition of the MLEPs; and positioning the MLEPs in the array so that when the array is viewed through glasses with corresponding polarized lenses, the viewer perceives the image displayed by the array as a three-dimensional image.

[0007] In another embodiment of the inventive concept, we propose a system having a single pixel represented by an LED, while maintaining the standard 2D functionality of the LED when displaying 2D content. In another embodiment of the present design, the described MLEPs advantageously eliminate the need for a special controller to handle two pixels in a single LED space, such that the MLEPs will be configured to have a similar form factor and functionality to a normal 2D LED, with similar image control devices as a standard 2D LED, but when 3D content is played through the MLEPs, the user will be able to see 3D images.

[0008] These and other advantages of the present invention will become apparent to those skilled in the art from the following detailed description and accompanying drawings.

[0009] Various resources, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of the preferred embodiments and the accompanying drawings in which like numerals represent like elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1A is a top left perspective view of a multi-polarization light emitting package (MLEPS) assembly, where each package has a polarization element and is arranged in its own partition.

[0011] Figure 1B is an upper left perspective view of another embodiment of a multi-polarized light emitting package (MLEPS) assembly, wherein each package has multiple light emitting elements, polarizing elements, and arranged in respective partitions.

[0012] Figure 1C yes Figure 1A , showing a reverse perspective view of a multi-polarized light emitting package (MLEPS) assembly, each package having a polarizing element and arranged in a respective partition.

[0013] Figure 2A is an upper left perspective view of another alternative MLEPS component with diagonally oriented partitions.

[0014] Figure 2B yes Figure 2A A reverse perspective view of another alternative MLEPS component in FIG. 1 , with diagonally oriented partitions.

[0015] Figure 3A is an upper left perspective view of an alternative MLEPS component with partitions separated.

[0016] Figure 3B is an upper left perspective view of another alternative MLEPS assembly having multiple light emitting elements and separation between partitions. Figure 3C Shows something like Figure 3B A front perspective view of another alternative embodiment of .

[0017] Figure 4 is a flow chart of one embodiment of a method of manufacturing a stereoscopic display system having an MLEPS array. DETAILED DESCRIPTION

[0019] The following discussion provides multiple exemplary embodiments of the subject matter of the present invention. Although each embodiment represents a single combination of inventive elements, the subject matter of the present invention is deemed to include all possible combinations of the disclosed elements. Thus, if one embodiment includes elements A, B, and C, and a second embodiment includes elements B and D, the subject matter of the present invention is also deemed to include other remaining combinations of A, B, C, or D, even if not explicitly disclosed.

[0020] The present design helps overcome the problems of previous designs by providing a method for manufacturing multi-polarization light emitting packages (MLEPs), wherein each MLEP includes multiple partitions, and each partition includes a light emitting element and a polarizing element, so that the MLEPs are positioned and oriented within the array to display 2D / 3D images or similar video content. It should be understood that any type of semiconductor package (or "SP") can be applied to the current design. Although the present description generally uses RGB (red, green, blue) semiconductor SPs, it should be understood that the present invention is not limited to this. Any type of semiconductor or similar device can be used, including but not limited to RGBY, RGBW (white), RGB plus infrared, OLED, digital RGB, and quantum dot LEDs. In general, the present design relates to the packaging of semiconductor packages for stereoscopic viewing.

[0021] Thus, the applications of the present design are varied and enable realistic 3D viewing in both outdoor and indoor events such as theaters, movie theaters, concerts and sporting events or anywhere the audience has appropriate glasses for 3D viewing. The present embodiment is configured to facilitate the manufacture of permanent 3D packaged semiconductor wafers or panels. When multi-polarized light emitting packages (MLEPs) are combined into large display screens, they can be used as standard 2D displays by providing 2D video or image content, or the display screen can display 3D content when the corresponding stereoscopic 3D video or still images are played using appropriate glasses. Larger display partitions (such as stadium screens) can beneficially use the teachings of this article to provide stereoscopic content.

[0022] Figure 1A 1 is a front perspective view of a multi-polarized light emitting package (MLEP) assembly 100 mounted on a substrate 130 with a mounting wall 140. Each MLEP is arranged in a partition within the assembly 100. Partition 105 includes a polarizing element 107, wherein a light emitting element 106 is arranged below the polarizing element 107. Partition 110 includes a polarizing element 112, wherein a light emitting element 111 is arranged below the polarizing element 112. Partition 115 includes a polarizing element 117, wherein a light emitting element 116 is arranged below the polarizing element 117. Partition 120 includes a polarizing element 122, wherein a light emitting element 121 is arranged below the polarizing element 122. In the depicted embodiment, the height of the mounting wall 140 is configured to extend a distance above the polarizing elements of each partition. Advantageously, the polarizing elements of the assembly 100 are arranged below the wall edge of the mounting wall 140, reducing possible crosstalk effects, wherein non-polarized light can escape from the light emitting elements and affect image quality. In a preferred embodiment, the mounting wall 140 is configured to be opaque to visible light.

[0023] Figure 1B Similar to Figure 1A, except that a plurality of light emitting elements are arranged below the polarizing element. Partition 105 includes light emitting elements 106A, 106B, and 106C, wherein light emitting elements 106A-106C are arranged below polarizing element 107. Partition 110 includes light emitting elements 111A, 111B, and 111C, wherein light emitting elements 111A-111C are arranged below polarizing element 112. Partition 115 includes light emitting elements 116A, 116B, and 116C, wherein light emitting elements 116A-116C are arranged below polarizing element 117. Partition 120 includes light emitting elements 121A, 121B, and 121C, wherein light emitting elements 121A-121C are arranged below polarizing element 122. In some embodiments, the polarizing element of assembly 100 includes an anti-corrosion compound (not shown) disposed on an exposed surface of the polarizing element to protect the surface from damage. In a preferred embodiment, the anti-corrosion compound has no effect on the polarized light emitted by the light emitting element of the assembly 100. In some embodiments, the anti-corrosion compound (not shown) is a resin. In other embodiments, the anti-corrosion compound is a glass material.

[0024] Figure 1C 1 is a reverse perspective view of assembly 100 mounted on substrate 130. Each light emitting element disposed in a partition further includes an anode and a cathode. Light emitting element 105 disposed in a partition includes an anode 108 and a cathode 109, light emitting element 111 includes an anode 113 and a cathode 114, light emitting element 116 includes an anode 118 and a cathode 119, and light emitting element 121 includes an anode 123 and a cathode 124. In a preferred embodiment, each light emitting element generates a color independent of the other light emitting elements within MLEP assembly 100 through the signals received by its anode and cathode. In other embodiments, partition 105 may include a second light emitting element (not shown) to generate a different color than light emitting element 106. In a related embodiment, assembly 100 includes a central cathode and each light emitting element has its own individual anode.

[0025] In some embodiments, the polarizing element can be lightly polished on the bottom-facing surface (the side the light-emitting element faces) to better adhere to the light-emitting element. The polarizing element can be flexible or non-flexible. In some embodiments, the non-flexible polarizing element can be made of acrylic or glass. Advantageously, the non-flexible polarizing element is more durable and can provide functionality for a longer period of time. For example, the non-flexible polarizing element can be used to make permanent outdoor display screens that will be exposed to various weather conditions. In other embodiments, the flexible polarizing element can be made of film or other light-isolating materials. Advantageously, the flexible polarizing element can be applied to uneven or irregular surfaces. For example, the flexible polarizing element can be installed above an irregularly shaped or otherwise damaged light-emitting element.

[0026] In the described embodiment, the first light emitting element is configured to emit a first color and a different second color. In a related embodiment, the first light emitting element is configured to additionally emit a third color different from the first color and the second color. In another alternative embodiment, each partition of the MLEPs further includes a second light emitting element configured to emit at least one of the first color and the second color. The light emitting elements may be semiconductors. Each semiconductor may be configured to emit red light, green light, or blue light.

[0027] In a preferred embodiment, partition 105 is separated from partition 110 by a first distance, partition 115 is separated from partition 120 by a second distance, and partition 105 is separated from partition 120 by a third distance. In some embodiments, the first distance is the same as the second distance. In a related embodiment, the second distance is the same as the third distance.

[0028] It is further contemplated that at least 100 MLEPs may be arranged across at least 10 rows. In a similar embodiment, at least 100 MLEPs may be arranged across at least 10 diagonals. In a preferred embodiment, at least one MLEP has a visually distinguishable feature selected from the group consisting of a key mark, a groove, and a cutout.

[0029] With respect to the use of LEDs in stereoscopic image projection in general, applicants refer to the design set forth in US Pat. No. 8,542,270, the entire contents of which are incorporated herein by reference.

[0030] Figure 2A is a front perspective view of an MLEPS assembly similar to FIG1 , except with diagonally oriented partitions and an alternative arrangement of polarizing elements mounted on a substrate. Each MLEP is arranged in a partition within assembly 230. Partition 205 includes polarizing element 207, wherein light emitting element 206 is arranged below polarizing element 207. Partition 210 includes polarizing element 211, wherein light emitting element 212 is arranged below polarizing element 211. Partition 215 includes polarizing element 217, wherein light emitting element 216 is arranged below polarizing element 217. Partition 220 includes polarizing element 222, wherein light emitting element 221 is arranged below polarizing element 222.

[0031] The polarizing element can be substantially fixed in place by a bonding solution. In addition, the bonding solution can be reactive or non-reactive. In some embodiments, the reactive bonding solution can be glue, epoxy resin or silicone resin. In other embodiments, the non-reactive bonding solution can be an acrylic polymer. The bonding solution or its derivatives used herein may refer to any one or more of a reactive bonding solution, a non-reactive bonding solution or a reactive and non-reactive bonding solution combination. The bonding solution is solidified by applying energy. In a preferred embodiment, a bonding solution can be provided between the light-emitting element and the polarizing element to ensure that the polarizing element is fixed on the light-emitting element. In another alternative embodiment, the bonding solution can be applied to the edge of the element shown, such as the edge of the polarizing element, to reduce the risk of shielding or obstructing the transmission of the light-emitting element.

[0032] Figure 2B 2 is a reverse perspective view of the assembly 200 mounted on the substrate 230. Each light emitting element disposed in the partition further includes an anode and a cathode. The light emitting element 205 disposed in the partition includes an anode 208 and a cathode 209, the light emitting element 211 includes an anode 213 and a cathode 214, the light emitting element 216 includes an anode 218 and a cathode 219, and the light emitting element 221 includes an anode 223 and a cathode 224. In a preferred embodiment, each light emitting element generates a color independent of the other light emitting elements in the MLEP assembly 200 through the signal received by its anode and cathode. In other embodiments, the partition 205 may include a second light emitting element (not shown) to generate a different color than the light emitting element 206.

[0033] Figure 3AA front perspective view of a multi-polarized light emitting package (MLEPs) assembly 300 mounted on a substrate 370 is shown. Light emitting elements, polarizing elements, and diffusing elements are arranged in partitions within the assembly 300, and the partitions are separated from each other by partition walls 350. Partition 310 includes a light emitting element 311, a diffusing element 312, and a polarizing element 313. In the depicted embodiment, the diffusing element 312 is disposed between the light emitting element 311 and the polarizing element 313. Partition 320 includes a light emitting element 321, a diffusing element 322, and a polarizing element 323. Partition 330 includes a light emitting element 331, a diffusing element 332, a polarizing element 333, and a visually distinguishable feature 360. Partition 340 includes a light emitting element 341, a diffusing element 342, and a polarizing element 343. In a preferred embodiment, a partition wall 350 is located between partition 310 and partition 320. In a similar embodiment, the partition wall 350 is opaque to visible light. In a related embodiment, a partition wall 350 is disposed between the polarization element 313 and the polarization element 333. In some embodiments, a second partition wall (not shown) is disposed between the partition 310 and the partition 320. In a preferred embodiment, the partition wall 350 is configured to reduce crosstalk of polarized light between the partitions. In one embodiment, the polarization element is configured to contact the partition wall 350. Advantageously, this configuration further ensures that no unpolarized light can escape from the partition, or that only light transmitted from the partition of the MLEPs assembly 300 is polarized light.

[0034] The diffuser element 312 is configured to be substantially similar in size to the polarizer element 313 so as to diffusely spread the brightness emitted from the light emitting element 311. Advantageously, this reduces the concentration of light on the polarizer element 313, thereby increasing the efficiency of the polarizer element 313 by reducing ghosting artifacts that interfere with the 3D effect. In some embodiments, the diffuser element 312 is a material. In other embodiments, the diffuser element 312 is a solution. In addition, the diffusion of light generated by the light emitting element 311 through the diffuser element 312 enhances the three-dimensional effect by: 1) light diffusion, which reduces the lumens per square millimeter value, enhancing the polarization effect, and 2) reducing the number of light spots, effectively smoothing the overall appearance of the display screen so that the content on the display screen does not appear to be noticeably pixelated when viewed at a closer distance. In the described embodiment, the addition of the diffuser element 140 disperses the light from the light emitting element 311, which would otherwise tend to "blow through" the polarizer element 313, resulting in a ghosting effect that may be detrimental to viewing.

[0035] Figure 3B Similar to Figure 3A, except that a plurality of light emitting elements are arranged below the polarizing element. Partition 310 includes light emitting element 311A, light emitting element 311B, and light emitting element 311C, wherein light emitting elements 311A-311C are arranged below polarizing element 313. Partition 320 includes light emitting element 321A, light emitting element 321B, and light emitting element 321C, wherein light emitting elements 321A-321C are arranged below polarizing element 323. Partition 330 includes light emitting element 331A, light emitting element 331B, and light emitting element 331C, wherein light emitting elements 331A-331C are arranged below polarizing element 333. Partition 340 includes light emitting element 341A, light emitting element 341B, and light emitting element 341C, wherein light emitting elements 341A-341C are arranged below polarizing element 343. Figure 3C Shows something like Figure 3B 0 is a front perspective view of another alternative embodiment in which multi-polarization light emitting packages (MLEPs) assemblies 300 , 375 , 380 , and 385 are mounted on a substrate 370 .

[0036] In a preferred embodiment, the diffuser element 312 is configured as an anti-glare surface to help reject outdoor or indoor ambient light from the glossy surface of the polarizing element 313. It can be considered that the diffuser material is used to reduce glare from light sources outside the display assembly. In some embodiments, the diffuser element 312 can be arranged in front of the custom cut shape of the polarizing element 313 to reduce glare from light sources outside the assembly 300. In some embodiments, in addition to the diffuser element 312 located between the light emitting element 311 and the polarizing element 313, an additional diffuser element (not shown) is arranged outside the polarizing element. Advantageously, this configuration will reduce light spots and increase the polarization of the light generated by the light emitting element 311. This will also reduce glare in the environment in which the display screen is located and protect the surface of the polarizing element 313 from damage. In a related embodiment, the diffuser element 312 also increases the viewing angle of the display screen by projecting a polarized image of the illuminated pixel onto the front surface of the diffuser element, so that the viewer can also see at a wide angle.

[0037] Figure 4 is a functional block diagram illustrating steps of a method of manufacturing a stereoscopic display system having an array of multi-polarization light emitting packages (MLEPs). Figure 4 It is taught to provide a first left partition, a second left partition, a first right partition, and a second right partition in each MLEPs (step 410), to provide at least a first light-emitting element and a polarizing element in each partition of the MLEPs (step 420), and to position the MLEPs in an array so that when the array is viewed through glasses having corresponding polarized lenses, a viewer perceives an image displayed by the array as a three-dimensional image (step 430).

[0038] The step of positioning the MLEPs within the array (step 430) further includes spacing the first left partition from the first right partition by a first distance (step 431), spacing the second left partition from the second right partition by a second distance (step 432), and spacing the first left partition from the second right partition by a third distance (step 433). In some embodiments, the first distance is the same as the second distance. In related embodiments, the second distance is the same as the third distance. When transmitting images in a corresponding stereoscopic video format, the right polarization elements and the left polarization elements are assembled in an alternating pattern in a series of LED modules or multiple LED modules, and their precise orientation combination can produce a 3D stereoscopic viewing experience when used with matching 3D glasses. The corresponding 3D video format matches one or more left-eye video pixels with left polarization LEDs and one or more right-eye video pixels with right polarization LEDs, all of which are mounted on a circuit board / substrate. In a preferred embodiment, when assembled in an LED module or LED display, the light-emitting elements in each MLEP are equidistant from the light-emitting elements in adjacent MLEPs.

[0039] In the described embodiment, a diffusion element is disposed between a first light emitting element and a polarizing element of at least one MLEP (step 440), and a first partition wall is disposed between a first left partition and a second left partition of at least one MLEP (step 450). In a preferred embodiment, the first partition wall is opaque to visible light. In a related embodiment, the first partition wall is disposed between a polarizing element of the first left partition and a polarizing element of the second left partition. In another preferred embodiment, the second partition wall is disposed between the first left partition and the first right partition.

[0040] In some embodiments, the first light emitting element is configured to emit a first color and a different second color. In a related embodiment, the first light emitting element is configured to additionally emit a third color different from the first color and the second color. In another embodiment, each partition of the MLEPs further includes a second light emitting element configured to emit at least one of the first color and the second color. It is further contemplated that at least 100 MLEPs may be arranged across at least 10 rows. In a similar embodiment, at least 100 MLEPs may be arranged across at least 10 diagonals. In a preferred embodiment, at least one MLEP has visually distinguishable features selected from key marks, grooves, and cutouts.

[0041] It will be appreciated by those skilled in the art that more modifications may be made in addition to those already described without departing from the inventive concept herein. Therefore, the subject matter of the present invention should not be limited except within the scope of the appended claims. In addition, when interpreting the specification and claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms "comprise" and "comprising" should be interpreted as referring to elements, parts or steps in a non-exclusive manner, indicating that the referenced elements, parts or steps may exist, or be utilized, or be combined with other elements, parts or steps that are not explicitly referenced. When the specification and claims refer to at least one item specified from a group consisting of A, B, C... and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.

Claims

1. A stereoscopic display system, comprising: An array of multi-polarization light emitting packages (MLEPs), wherein: Each of the MLEPs includes a first left partition, a second left partition, a first right partition, and a second right partition; and Each partition of the MLEPs comprises at least a first light emitting element and a polarizing element; and The MLEPs are positioned and oriented in an array so that when the array is viewed through glasses having corresponding polarized lenses, the viewer perceives the image displayed by the array as a three-dimensional image. 2 . The stereoscopic display system according to claim 1 , wherein the first light emitting element is configured to emit a first color. 3 . The stereoscopic display system according to claim 2 , wherein the first light emitting element is configured to emit a second color different from the first color. 4 . The stereoscopic display system according to claim 3 , wherein the first light emitting element is configured to additionally emit a third color different from the first color and the second color. 5 . The stereoscopic display system of claim 2 , wherein each partition of the MLEPs further comprises a second light-emitting element configured to emit at least one of the second color and the third color.

6. The stereoscopic display system according to claim 1, wherein in each MLEP of the array of multi-polarization light emitting packages: The first left partition is separated from the first right partition by a first distance, The second left partition is separated from the second right partition by a second distance, and The first left partition is separated from the second right partition by a third distance. The stereoscopic display system according to claim 6 , wherein the first distance is the same as the second distance. The stereoscopic display system according to claim 6 , wherein the second distance is the same as the third distance.

9. The stereoscopic display system of claim 1, wherein at least 100 MLEPs are arranged in an array across at least 10 rows.

10. The stereoscopic display system of claim 1, wherein at least 100 MLEPs are arranged in an array across at least 10 diagonals.

11. The stereoscopic display system of claim 1, wherein at least one of the MLEPs has a visually distinguishable feature selected from the group consisting of a key mark, a groove, and a cutout.

12. The stereoscopic display system of claim 1, wherein at least one of the MLEPs comprises a diffusion element disposed between the first light emitting element and a polarizing element. 13 . The stereoscopic display system of claim 1 , wherein at least one MLEP comprises a first partition wall disposed between the first left partition and the second left partition. The stereoscopic display system according to claim 13 , wherein the first partition wall is opaque to visible light. 15 . The stereoscopic display system according to claim 13 , wherein the first partition wall is disposed between the polarization element of the first left partition and the polarization element of the second left partition. 16 . The stereoscopic display system according to claim 13 , further comprising a second partition wall disposed between the first left partition and the first right partition.

17. A method of manufacturing a stereoscopic display system having an array of multi-polarization light emitting packages (MLEPs), providing a first left partition, a second left partition, a first right partition, and a second right partition within each of the MLEPs; providing at least a first light emitting element and a polarizing element in each partition of the MLEPs; and The MLEPs are positioned within the array such that when the array is viewed through glasses having corresponding polarized lenses, the viewer perceives the image displayed by the array as a three-dimensional image. The method of claim 17 , wherein the first light emitting element is configured to emit a first color.

19. The method of claim 18, wherein the first light emitting element is configured to emit a second color different from the first color.

20. The method of claim 19, wherein the first light emitting element is configured to additionally emit a third color different from the first color and the second color.

21. The method of claim 19, wherein each partition of the MLEPs further comprises a second light emitting element configured to emit at least one of the first color and the second color.

22. The method of claim 17, further comprising: In at least one MLEP, Separating the first left partition from the first right partition by a first distance; Separating the second left partition from the second right partition by a second distance; as well as The first left partition is spaced apart from the second right partition by a third distance.

23. The method of claim 22, wherein the first distance is the same as the second distance. The stereoscopic display system according to claim 22 , wherein the second distance is the same as the third distance.

25. The method of claim 17, further comprising arranging the at least 100 MLEPs across at least 10 rows.

26. The method of claim 17, further comprising arranging at least 100 MLEPs across at least 10 diagonals.

27. The method of claim 17, wherein at least one of the MLEPs has a visually distinguishable feature selected from the group consisting of a key mark, a groove, and a cutout.

28. The method of claim 17, further comprising positioning a diffusion element between the first light emitting element and a polarizing element of at least one of the MLEPs.

29. The method of claim 17, further comprising providing a first partition wall between the first left partition and the second left partition of at least one MLEPs.

30. The method of claim 29, wherein the first partition wall is opaque to visible light.

31. The method of claim 29, wherein the first partition wall is disposed between the polarization element of the first left partition and the polarization element of the second left partition.

32. The method of claim 29, further comprising providing a second partition wall between the first left partition and the first right partition.

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