BACKGROUND

The 2D display technology have been evolved for decades . Most popular electric products like TV, laptop , tablets , mobile phone , computer monitor all have display screens . The current mainstream 2D display technology usually use opacity display screen . While this invention introduced a new 2D transparent display technology which not only could be used in electric products but also used in shop windows as display screen .

SUMMARY

This invention introduced a new way to make 2D transparent display by using optical elements instead of use transparent material . nd in this way many different LED could be used for 2D transparent display such as OLED, microLED, Quantum dot LED (QLED) , or even LCD fits the size scale configuration . The light from the back flow through the tiny individual display pixels by using optical lens with focus function will make the display device transparent from another side . Add one liquid crystal layer to control the overall transparency, or j ust add liquid crystal to each individual display pixel will provide a display screen with RGBA channels , which make it possible to display black, white and transparent pixel on screen at the same time correctly . And it also could add another display pixels grid at back which make a dual-view from both sides , it will display different context from each side , and it is also transparent from both sides .

According to one embodiment disclosed herein, a 2D transparent device configuration is provided . This device includes optical micro lens , display pixels grid, pinholes in middle of each pixels . The optical micro lens could be refractive optics or diffractive optics or Achromatic metasurface lens .

According to another embodiment disclosed herein, a 2D transparent device configuration is provided . This device includes optical micro lens , display pixels grid, pinholes in middle of each pixels and a liquid crystal layer . The optical micro lens could be refractive optics or diffractive optics or Achromatic metasurface lens . The liquid crystal layer is used for control the whole transparency of the display screen .

According to another embodiment disclosed herein, a 2D transparent device configuration is provided . This device includes optical micro lens , display pixels grid, pinholes in middle of each pixels and liquid crystal layer at each pixels . The optical micro lens could be refractive optics or diffractive optics or Achromatic metasurface lens . The liquid crystal layer is used for control the transparency of each individual pixel in the display screen .

According to another embodiment disclosed herein, a 2D transparent device configuration is provided . This device includes optical micro lens , dual display pixels grids , pinholes in middle of each pixels . The optical micro lens could be refractive optics or diffractive optics or Achromatic metasurface lens .

According to another embodiment disclosed herein, a 2D transparent device configuration is provided . This device includes optical micro lens , dual display pixels grids , pinholes in middle of each pixels and a liquid crystal layer . The optical micro lens could be refractive optics or diffractive optics or Achromatic metasurface lens . The liquid crystal layer is used for control the transparency of each individual pixel in the display screen .

BRIEF DESCRIPTION OF THE DRAWINGS :

FIG . l is view of three 2D transparent device structures with different focus optics : Ref ractive optics , Diffractive optics and Achromatic metasurface in accordance with an embodiment of the present technology .

FIG . 2 is 2D transparent device structure with dual view configuration in accordance with an embodiment of the present technology .

FIG . 3 is the light path from bi-direction in accordance with an embodiment of the present technology . DETAILED DESCRIPTION

Design :

FIG . l is three different configurations for the 2D transparent device . The principles behind the three configurations are the same , the only difference is the focus lens . The left one use refractive optics lens , the middle use diffractive optics lens , and the right use achromatic metasurface as focus lens . Each display pixels 102 lays between two refractive optics lens 101 . And similar configuration for diffractive optic lens 103 and achromatic metasurface lens 104 . Their basic function is focus all the incoming light from back to pass through the pinholes in the middle of the display pixel and flow through another lens to the front which make the device transparent . Since the optics system is symmetric the lights could flow in both direction, so it is transparent from both sides . And it is clearly showed in FIG . 3 .

FIG . l also contain the configuration layout of the display pixels grid, there are two mode could be used : each subpixel ( R or G or B ) covered by one lens 102a or one pixel ( RGB ) covered by one lens 102b . And the layout mode of display pixels grid for the three configurations are same .

FIG . 2 is another configurations which with additional properties . The 2D transparent device configuration in FIG . 2 is similar to FIG . l , the top left figure of each sub graph with an additional liquid crystal layer 203 , which will be used to control the overall transparency . The top right figure of each sub graph with liquid crystal 206 at each individual display pixels , which will give each pixel the ability to control its transparency independently . And this will make a RGBA display screen, which means it not only display RGB as regular display device but also contain an alpha channel , which will make black, white , and transparent pixel to show at the same time correctly . The bottom left figure of each sub graph with dual display pixels grid layers 207 which will make this configuration suitable for display different context from both sides , and no matter what side to choose it is both transparent display . The bottom right figure of each sub graph contain dual display pixels grid layers 208 and a liquid crystal layer 203 , the liquid crystal layer 203 is used to control the overall transparency . FIG . 3 show light flow through both directions , which make it transparent from both sides .

Practical example :

The available of 2D transparent device is relevant to the size scale configuration . The Organic Light Emitting Diode functional layers could be made with thickness about 2 pm. According the fabrication technology described in reference [ 2 ] [ 3 ] , the refractive optics lens could be made as microlens array (MLA) , with diameter about 50pm, and this will result in nearly 500 DPI ( dot per inch) , that quite precise enough for TV usage . In the reference [ 1 ] micro structure even with diameter about 15pm could be fabricated, which make this 2D transparent display technology suitable for tablet or mobile phone which need small screen .

Diffractive optics and achromatic metasurface with focus function are usually fabricated at nanometer scale , which make them suitable to almost all the display device , the only limit is the fabrication cost .

And it is also possible add light membrane to allow light flow only in one direction, the display device should only be transparent in one side , while from another side it will not be transparent . One potential usage is for tablets , it will provided the front user a transparent display screen and also better privacy for opacity from back .

This invention enhance transparency by using optical lens instead of using transparent material . So in this way many different LED could be used for transparent display such as OLED, microLED, Quantum dot LED (QLED) , or even LCD fits the size scale configuration . And all these applications should also covered by this invention . Since OLED could be made flexible , the optics lens might always be rigid, but the lens could be embedded in elastic padding material , so technically it is possible make flexible 2D transparent display device . And this should also be covered by this invention .

The subj ect matter described above is provided by way of illustration only and should not be constructed as limiting . Various modifications and changes may be made to the subj ect matter described herein without following the example embodiment but use the similar principle to make the display device transparent should also covered by this invention . REFERENCE :

1. Shape-controlled, high fill-factor microlens arrays fabricated by a 3D diffuser lithography and plastic replication method.

Sung-11 Chang and Jun-Bo Yoon

13 December 2004 / Vol. 12, No. 25 / OPTICS EXPRESS

2. Nanoscale 2.5-dimensional surface patterning with plasmonic Lithography.

Howon Jung, Changhoon Park, Seonghyeon Oh & Jae W. Hahn www . nature . com/ scientif icreports

3. Two-photon 3D lithography: A Versatile Fabrication Method for Complex 3D Shapes and Optical Interconnects within the Scope of Innovative Industrial Applications

V. Schmidt, L. Kuna, V. Satzinger, G. Jakopic, G. Leising JLMN- Journal of Laser Micro/Nanoengineering Vol. 2, No. 3, 2007