Head mounted display with angle compensation
A focusing lens is configured to focus display light for an eye of a user. A display is configured to emit the display light having an illumination profile that increases in brightness as a distance from a middle of the display increases. The focusing lens is configured to receive the display light and focus the display light as image light that has a brightness profile that has substantially uniform brightness across the image.
1. A head mounted display (HMD) comprising:
a focusing lens configured to focus display light at an eyebox; and
a display configured to emit the display light having an illumination profile that is non-uniform, wherein the display includes a lightguide to generate the illumination profile that is non-uniform and that progressively increases in brightness from a middle of the lightguide to each edge of the lightguide, and wherein the focusing lens is configured to receive the display light and focus the display light as image light that has a brightness profile that has substantially uniform brightness across the image at the eyebox.
2. The HMD of claim 1 , wherein the illumination profile includes an illumination gradient that progressively increases the brightness as the distance from a middle of the display increases, a highest brightness value of the illumination gradient being at an edge of the display and a lowest brightness value of the illumination gradient being at the middle of the display.
3. The HMD of claim 1 , wherein the display includes:
a display pixel array; and
a backlight emitter to provide illumination light, wherein the lightguide is configured to receive the illumination light from the backlight emitter and distribute the illumination light to illuminate the display pixel array according to the illumination profile.
4. The HMD of claim 3 , wherein the display is configured in an edge-lit architecture.
5. The HMD of claim 3 , wherein the lightguide includes a gradient of light extraction features that provides the illumination profile, and wherein the light extraction features output a higher brightness value of the illumination light as a particular light extraction feature gets farther from the middle of the lightguide and gets closer to an edge of the display pixel array.
6. The HMD of claim 1 , wherein the display includes:
a liquid crystal display pixel array arranged in rows and columns;
a two-dimensional array of backlight light emitting diodes (LEDs) for illuminating the liquid crystal display pixel array; and
pixel driving circuitry configured to drive the backlight LEDs with increasing brightness as a distance from a middle of the two-dimensional array of backlight LEDs increases.
7. The HMD of claim 1 , wherein the display includes:
a liquid crystal display pixel array arranged in rows and columns; and
a two-dimensional array of backlight light emitting diodes (LEDs) for illuminating the liquid display pixel array, wherein a density of the backlight LEDs increases as a distance from a middle of the two-dimensional array of backlight LEDs increases.
8. The HMD of claim 1 , wherein the focusing lens includes a central optical axis, and wherein the central optical axis of the focusing lens runs through the middle of the display.
9. The HMD of claim 1 , wherein the illumination profile includes concentric illumination regions that increase in brightness.
10. A display comprising:
a display pixel array for generating display light;
a backlight assembly configured to illuminate the display pixel array with illumination light having an illumination profile that is non-uniform, wherein images included in the display light have the illumination profile; and
a lightguide to distribute the illumination profile that is non-uniform and that progressively increases in brightness from a middle of the lightguide to each edge of the lightguide.
11. The display of claim 10 , wherein the illumination profile includes an illumination gradient that progressively increases the brightness as the distance from a middle of the display increases, a highest brightness value of the illumination gradient being at an edge of the display and a lowest brightness value of the illumination gradient being at the middle of the display.
12. The display of claim 10 , wherein the backlight assembly includes:
one or more backlight emitters to provide the illumination light, wherein the lightguide is configured to receive the illumination light from the backlight emitters and distribute the illumination light to illuminate the display pixel array according to the illumination profile.
13. The display of claim 12 , wherein the display is configured in an edge-lit architecture.
14. The display of claim 12 , wherein the lightguide includes a gradient of light extraction features that provides the illumination profile, and wherein the light extraction features output a highest brightness value of the illumination light as a particular light extraction feature gets farther from the middle of the lightguide and gets closer to an edge of the display pixel array.
15. The display of claim 12 , wherein the display pixel array includes a liquid crystal display pixel array arranged in rows and columns, and wherein the backlight emitters include light emitting diodes (LEDs).
16. The display of claim 15 further comprising:
pixel driving circuitry, wherein the LEDs are arranged in a two-dimensional array, and wherein the pixel driving circuitry is configured to drive the two-dimensional array of LEDs with increasing brightness as a distance from a middle of the two-dimensional array of LEDs increases.
17. The display of claim 15 , wherein the LEDs are arranged in a two-dimensional array of light emitting diodes (LEDs) for illuminating the liquid crystal display pixel array, and wherein a density of the two-dimensional array of LEDs increases as a distance from a middle of the two-dimensional array of LEDs increases.
18. The display of claim 10 , wherein the illumination profile includes concentric illumination regions that increase in brightness.