Facebook Technologies, LLC (Menlo Park, CA)

A method, in accordance with an embodiment, involves accessing the first rendered image which was generated at a first framerate. The method includes generating, based on the initial rendered frame, several sub-frames at an additional frame rate that is greater than the first frame rate. The first sub-frame of one or more sub-frames is generated by determining a displacement measurement that is associated with the anticipated movement of an optics component in a display system, and applying, based on the displacement measure one or more transforms to the initial rendered frame to create the initial sub-frame. The first frame is intended to be observed by a person using the optical component of the display system. This technique involves showing one or more subframes at the second frame rate. The one or more sub-frames can be seen by the user through the optics part of the display system.

Portable displays have seen a dramatic increase in popularity, which has led to an increased need for lightweight and efficient displays. But, some of these displays may sacrifice quality or frame rate in order to enable lower power requirements and, in the case ofbody-carried displays that are more comfortable to wear. The sacrifices could result in an unsatisfactory user experience. Displays may reduce brightness, or have lower resolution, color depth or display frame rates that exceed the maximum and this reduces the attraction of using a display. A low frame rate may not be appropriate for certain applications. The quality of the display can have an impact on the perception of the quality of an artificial-reality experience. The significant computing cost needed to provide quality user experiences is a challenge.

In certain instances, displays may function by sending images to a user at a high frame rate (e.g. 100 to 200 Hz). Each frame is displayed for a specific time frame before being removed from the display. Visual artifacts could be produced when a frame is displayed. This can be due to an inconsistency in the position of the user during the time that the frame was rendered and when it is displayed on the screen. The display can be set to up-sample frame rates, such as 10 kHz to avoid visual artifacts. The display could produce dozens of sub-frames per frame it receives. The high frame rate may result in the image seen by users to be an average of many sub-frames instead of a single frame. This permits light emitting sources with less brightness to be used in the display without degrading quality of the image or color. But, the on-time for each source can be increased. This means that a display can be utilized in a more power efficient manner (e.g., emitting less bright light) using components that are less costly, as explained below. Unique image correction techniques can also be accomplished due to the speed of frame.

Certain embodiments permit the modification of the frame’s position depending on changes in the eye of the user or his head’s position. For instance, if the focus of the user shifts to the left between sub-frames, a pan logicblock may apply a two-dimensional shift on the image of the frame in question. This causes the frame to shift to the left by a certain amount of pixels, ensuring that the image is in the same location within the user?s field of view despite their eye movements.

In particular embodiments, two-dimensional shifts could be utilized to correct for any irregularities in the display like manufacturing defects in the underlying light-emitter arrays or malfunctioning light emitters that emit less light than is required, or no light. The result of the up-sampled frame rate results in the perception of the user to appear as an amalgamation of several sub-frames, and, for example, sub-frame image pixel colours for the light emitter that is malfunctioning could be sharedamong nearby light emitters by moving the entire sub-frame one or two pixels in a repeating pattern. The effect may be to correct image errors without blurring the image.

A particular embodiment may use a two- and three-dimensional dithering effect to the display to spread pixel value errors among nearby light emitters and possibly to subsequent frames. Dithering can be accomplished in both a spatial as well as a temporal dimension. Combining the dithering effect with the compositing effects of a high-up-sampled framerate could allow the display to mimic the appearance of a display that has advanced accuracy in color (8 or 10 bits), while also being composed of light emitters that possess a lower color accuracy (4 or 5 bits). Further, dithering and composing can be used to correct display irregularities as well as mimic other components that are more costly by using components that have a lower costs and better up-sampled frame rates as well as the capabilities of the human eye.

Embodiments of the invention may include or be implemented in conjunction with an artificial reality system. Artificial reality is an arrangement or form of realities that has changed prior to being presented to a user. It could be a virtual reality, an enhanced reality or mixed reality, a hybrid reality, as well as other variations. Artificial reality content can be created entirely or combined with captured content (e.g. real-world photos). The content created by artificial reality may include video, audio, haptic feedback or a combination of the two or any combination thereof. It can be displayed in a single channel, or in multiple channels (such as stereo videos that provide a 3D effect for the viewer). Artificial reality is also linked to accessories, products, services or applications in particular ways. These may include content that is created in artificial reality, and/or actions performed in artificial reality. Artificial reality systems that offer artificial reality content can be used on a variety of platforms. This includes a head-mounted display (HMD) or a standalone HMD, or any other hardware platform capable of providing artificial reality content for one or more viewers.

The embodiments described herein are only examples and the nature of this disclosure isn’t only limited to the specific embodiments described. A single embodiment may include any or all of the elements, components functions, features and methods described herein. Embodiments based on the invention are in particular disclosed in the attached claims that relate to a method, storage device, a system, or a computer program product, wherein any feature described in one claim category,e.g. Method can also be claimed under a different claim category. system. The dependencies or references back in the claims attached are selected solely for formal reasons. Any subject matter that arises from a deliberate refer back to any previous claims, in particular multiple dependencies, can also be claimed. This means that every claim and feature can be revealed regardless of whether dependencies are specified in the claims that are attached. The subject matter could comprise not just combinations of features mentioned in the attached claims but any combination of features within the claims. Each feature of the claims could be used in conjunction with another feature or a combination of features. Any of the embodiments or features described herein can be claimed as a distinct claim, or in combination with any other features or embodiments described in this document.

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