received by the International Bureau on 30 March 2016 (30.03.16)

1. A one way display having a front surface and a back surface, the front surface being designed for displaying images to a display observer who is viewing the display from the front surface, and the back surface being designed for providing see-through capabilities to a display observer who is viewing the display from the back surface, the display comprising:

at least two layers made of a transparent material;

a plurality of primary light emitting elements sandwiched between said layers of a transparent material and mounted across the area of the display in groups, each group of light emitting elements making up a colored pixel of the display, and each pixel consisting of at least three adjacent or stacked light emitting elements providing component colors of light so as to provide required color of the pixel by combination of the component colors of light emitted from the light emitting elements;

a plurality of narrow-band filters arranged in groups, each group consisting of at least three red, green and blue narrow-band filters mounted in parallel to said red, green and blue light emitting elements making up the display pixels to block the lights in the narrow-band ranges of red, green and blue respectively towards the back surface of the display;

wherein the display is further provided with a plurality of additional light emitting elements mounted across the area of the display in groups, close to said narrow-band filters, each group of the additional light emitting elements making up a colored pixel of the display, and each pixel consisting of at least three adjacent or stacked light emitting elements providing component colors of light and operably connected with a pixel driving circuitry for applying the driving signals on the electrodes of the additional light emitting elements for neutralizing the colors of lights from plurality of primary light emitting elements that get through said narrow-band filters towards the display back surface and rendering the emitted light on the display back surface from the plurality of primary light emitting elements in conjunction with the plurality of additional light emitting elements white or nearly white at a daytime, or gray or nearly gray at an evening time.

2. A one way display in accordance with claim 1, wherein said each group of at least three primary light emitting elements and of at least three additional light emitting elements-providing component colors of light and making up each colored pixel are red, green and blue light emitting elements.

3. A one way display in accordance with claim 1 or 2, wherein the light emitting elements are light emitting diods (LEDs).

4. A one way display in accordance with claim 1 or 2, wherein the light emitting elements are organic light emitting diods (OLEDs).

5. A one way display in accordance with any one of claim 1, wherein said narrow-band filters are notch filters.

6. A one way display in accordance with claim 5, wherein the notch filters are color notch polarizers.

7. A one way display in accordance with claim 1, which is further provided with light guides, such as optical fibers disposed on a pixel by pixel basis, distal ends of the optical fibers being arranged such that they are abutted against the display front surface, and proximal ends of the optical fibers being operatively connected to the light emitting elements.

8. A one way display in accordance with claim 1, wherein said layers are of flat shape.

9. A one way display in accordance with claim 1, wherein said layers are of tubular shape.

10. A one way display in accordance with claim 1, wherein said layers are of cubic shape.

11. A method of driving a one way display pixel elements comprising the steps of:

providing at least two layers made of a transparent material;

providing a plurality of primaryjight emitting elements sandwiched between said layers of a transparent material and mounted across the area of the display in groups, each group of light emitting elements making up a colored pixel of the display, and each pixel consisting of at least three adjacent or stacked light emitting elements providing component colors of light so as to provide required color of the pixel by combination of the component colors_of light emitted from the light emitting elements; providing a plurality of narrow-band filters arranged in groups, each group consisting of at least three narrow-band filters mounted in parallel to said light emitting elements making up the display pixels to block the lights in the narrow-band ranges of component colors of light emitted from respective primary light emitting elements towards the back surface of the display;

providing a pixel driving circuitry to reproduce images to be displayed by the one way display;

the method further comprising the step of providing a plurality of additional light emitting elements mounted across the area of the display in groups close to said narrow -band filters, each group of the additional light emitting elements making up a colored pixel of the display, and each pixel consisting of at least three adjacent or stacked light emitting elements providing component colors of light so as to provide required color of the pixel by combination of component colors of light and to neutralize the colors of lights passing through said narrow -band filters towards the display back surface;

computing by the driving circuitry the magnitude of the signals and applying the signals on the electrodes of the additional light emitting elements for rendering the emitted light from the plural primary light emitting elements in conjunction with the plural additional light emitting elements white or nearly white at a daytime, or gray or nearly gray at an evening time.

12. A method in accordance with claim 11, wherein said each group of at least three primary light emitting elements and of at least three additional light emitting elements-providing component colors of light and making up each colored pixel are red, green and blue light emitting elements.

13. A method of driving a one way display pixel elements in accordance with claim 11, wherein the light emitting elements are light emitting diods (LEDs).

14. A method of driving a one way display pixel elements in accordance with claim 11, wherein the light emitting elements are organic light emitting diods (OLEDs).

15. A method of driving a one way display pixel elements in accordance with claim 11, wherein said narrow-band filters are notch filters.

16. A method of driving a one way display pixel elements in accordance with of claim 16, wherein the notch filters are color notch polarizers.