Weapon sight systems

1. A clip-on sight system configurable to operate in combination with a primary scope of a firearm configured to fire ammunition received from a magazine inserted into the firearm, the clip-on sight system comprising:

a housing configured to operatively connect to the firearm, the housing comprising a first optical element configured to admit light and a second optical element that enables transmitting a direct view image of a target scene to the primary scope; and

a sight system at least partially housed within the housing, the sight system configured to process the admitted light, to superimpose an image on at least a portion of the direct view image, and to transmit the direct view image and the image to the second optical element, the sight system comprising:

a beam splitter configured to:

permit transmission of visible light with a luminous transmittance greater than or equal to 70% using CIE Illuminant D65; and

permit reflection of visible light with a luminous reflectance less than or equal to 30% using CIE Illuminant D65; and

a graphics projection system configured to generate a computer-generated image, the graphics projection system comprising a 2-dimensional display with a luminance greater than or equal to 50,000 cd/m 2 and a power consumption of less than or equal to 100 mW at an average picture level (APL) of 6%.

2. The clip-on sight system of claim 1 , wherein a sum of the luminous transmittance and the luminous reflectance is less than or equal to 100%.

3. The clip-on sight system of claim 1 , wherein the graphics projection system has a refresh rate of 10 Hz or less.

4. The clip-on sight system of claim 1 , wherein the 2-dimensional display comprises a set of individually-addressable pixels and wherein the graphics projection system is configured to turn on a subset of the set of individually-addressable pixels when displaying the image.

5. The clip-on sight system of claim 1 , wherein the beam splitter is configured to permit the reflection of visible light without filtering frequencies within a visible light spectrum.

6. The clip-on sight system of claim 1 , wherein the 2-dimensional display comprises a red light display, a green light display, a blue light display, or a full color display.

7. The clip-on sight system of claim 1 , wherein the 2-dimensional display has a power consumption of less than or equal to 50 mW at the APL of 6%.

8. The clip-on sight system of claim 7 , wherein the 2-dimensional display has a power consumption of less than or equal to 25 mW at the APL of 6%.

9. The clip-on sight system of claim 8 , wherein the 2-dimensional display has a power consumption of less than or equal to 15 mW at the APL of 6%.

10. The clip-on sight system of claim 1 , wherein the 2-dimensional display comprises a pixel density of more than or equal to 3000 pixels per inch (PPI).

11. The clip-on sight system of claim 10 , wherein the 2-dimensional display comprises a pixel density of more than or equal to 5000 PPI.

12. The clip-on sight system of claim 1 , wherein the 2-dimensional display has a luminance greater than or equal to 100,000 cd/m 2 .

13. The clip-on sight system of claim 12 , wherein the 2-dimensional display has a luminance greater than or equal to 250,000 cd/m 2 .

14. The clip-on sight system of claim 1 , wherein the image comprises one or more of the following: an indication of ammunition within a magazine; a reticle image; symbology associated with a firearm; symbology associated with the clip-on sight system; symbology associated with the target scene; or symbology associated with a user's kit; an indication of a distance to a target within the target scene; or an indication of a battery level of a battery.

15. The clip-on sight system of claim 1 , wherein the image comprises a thermal image of the target scene or a video image of the target scene.

16. The clip-on sight system of claim 1 , wherein the image comprises an indication of data received from a data source.

17. The clip-on sight system of claim 16 , wherein the data source comprises a magazine or a firearm.

18. The clip-on sight system of claim 16 , wherein the data is received from a wireless connection, a wired connection, or an optical connection to the data source.

19. The clip-on sight system of claim 1 , wherein the 2-dimensional display comprises a micro light-emitting diode (micro-LED) display or a quantum dot organic light-emitting diode (QD-OLED) display.

20. The clip-on sight system of claim 1 , wherein the graphics projection system further comprises a processor configured to generate the image based on data received by the processor.

21. The clip-on sight system of claim 1 , wherein the direct view image and the image are directly viewable via the second optical element.

22. The clip-on sight system of claim 1 , wherein the direct view image and the image are viewable via the primary scope positioned between the second optical element and an eye of a user.

23. The clip-on sight system of claim 1 , wherein, when the housing is operatively connected to the firearm, the second optical element is aligned with a first optical element of the primary scope enabling a user to observe a target scene through an optical path formed by the clip-on sight system in combination with the primary scope.

24. The clip-on sight system of claim 1 , wherein the beam splitter comprises a coating on a first surface of the beam splitter.

25. The clip-on sight system of claim 24 , wherein the coating is configured to permit the transmission of visible light with a luminous transmittance greater than or equal to 80% using CIE Illuminant D65.

26. The clip-on sight system of claim 24 , wherein the beam splitter further comprises an anti-reflective coating on a second surface of the beam splitter, wherein the second surface is opposite to the first surface of the beam splitter.