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公开(公告)号：US10553164B1
公开(公告)日：2020-02-04
申请号：US16377926
申请日：2019-04-08
摘要： A system for calibrating a liquid crystal display (LCD) includes a plurality of temperature sensors, a storage medium, and a controller. Each temperature sensor measures a current temperature of at least one pixel in the LCD. The storage medium stores information about latencies for any LC-based pixel, wherein each latency corresponds to a time period for transition from a starting to an ending illumination state for one temperature of the LC-based pixel. The controller determines, based on the current temperature, the transition information and frame information, a time for each pixel in at least a portion of the LCD to transition from a first to a second illumination state. The controller computes, based on transition times, an LC transition time for at least the portion of the LCD and performs calibration of at least the portion of the LCD based on the LC transition time.
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公开(公告)号：US10551879B1
公开(公告)日：2020-02-04
申请号：US16234284
申请日：2018-12-27
摘要： A distortion calibration system generates a distortion map for a head-mounted display (HMD). The system includes a camera that takes pictures of a test pattern displayed by the HMD. The images are taken at different camera positions and/or states of the HMD. The system determines a distortion map using the captured images, and uploads it to the HMD as part of, e.g., an optical model. The HMD comprises an electronic display, an eye tracking unit, an optics block, and a module. The module estimates distortion values based on eye tracking information from the eye tracking unit, an optical model, and a state of the HMD (e., a distance between the optics block and the electronic display). The module determines an adjusted state of the HMD using the estimated distortion values, the eye tracking information, and the optical model, and adjusts the state of the HMD to the adjusted state.
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公开(公告)号：US10529276B2
公开(公告)日：2020-01-07
申请号：US15863664
申请日：2018-01-05
发明人： Cheonhong Kim , Evan M. Richards
IPC分类号： G09G3/3225 , G09G3/34 , G09G3/36
摘要： A display device may include (1) a display panel with at least one pixel element and (2) a display driver configured to (a) transition the pixel element to a first state, (b) illuminate, after the pixel element transitions to the first state, the pixel element for a first period of illumination, (c) refrain, after the first period of illumination, from illuminating the pixel element for a period of no illumination, (d) illuminate, while the pixel element is still in the first state and after the period of no illumination, the pixel element for a second period of illumination to at least reduce perceived flickering of the display panel, and (e) transition, after the second period of illumination, the pixel element from the first state to a second state. Various other apparatus, systems, and methods are also disclosed.
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公开(公告)号：US10303211B2
公开(公告)日：2019-05-28
申请号：US15422334
申请日：2017-02-01
发明人： Shie Ping Jeffrey Tseng , Evan M. Richards , Shizhe Shen , Jianru Shi , Yue Shi
摘要： An organic light emitting diode (OLED) display including a conic OLED panel portion and a base OLED panel portion. The conic OLED panel portion includes peripheral display surfaces forming a truncated conic shape with an open base region around a center of the conic OLED panel portion. The OLED base portion includes a display surface. The base OLED panel portion is positioned to cover the open base region of the conic OLED panel portion such that the peripheral display surfaces surround the base display surface. The OLED display approximates a circular convex display. The conic OLED panel portion may be fabricated from a flat, flexible OLED panel portion that is bent along the fold regions defining bending axes between the peripheral display surfaces to form the truncated conic shape.
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公开(公告)号：US10175414B2
公开(公告)日：2019-01-08
申请号：US15403928
申请日：2017-01-11
发明人： Jianru Shi , Evan M. Richards
IPC分类号： F21V8/00
摘要： A liquid crystal display (LCD) device a LCD panel and a segmented backlight for illuminating the LCD panel. The backlight includes a light guide having an array of light channels. The array of light channels is defined by an array of notches on the bottom surface of the light guide. Light emitting diodes (LEDs) are disposed along the side surface of the light guide to emit light in a first direction into the array of light channels of the light guide. The array of light channels receives the light from the LEDs and directs the light in a second direction from the top surface of the light guide toward the LCD panel. One or more LEDs may selectively emit light into each light channel. The notches defined between light channels controls light leakage across adjacent light channels.
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公开(公告)号：US10161791B2
公开(公告)日：2018-12-25
申请号：US15385776
申请日：2016-12-20
发明人： Ye Yin , Simon Hallam , Shizhe Shen , Evan M. Richards
摘要： An apparatus for measuring characteristics of an electronic display panel includes an array of optical elements. Each optical element has a first surface and a second surface. The first surface faces the electronic display panel and receives light from pixels of the electronic display panel. The second surface faces away from the electronic display panel and has an area smaller than the area of the first surface. The second surface emits a combined version of the light received by the first surface. The apparatus further includes a light sensor facing the second surface to measure one or more parameters of the emitted light.
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公开(公告)号：US10140955B1
公开(公告)日：2018-11-27
申请号：US15582307
申请日：2017-04-28
IPC分类号： G09G3/3225 , G09G5/10
摘要： A system for calibrating an organic light emitting diode (OLED) display is presented. The calibration system includes a series of photodiodes coupled to at least a portion of illumination elements of the OLED display, a controller, and a driver circuit. The series of photodiodes is configured to measure, for one or more illumination elements, illumination latencies and time delays associated with different brightness levels. The controller obtains, for each illumination element, information about brightness levels associated with image light emitted from that illumination element for at least two consecutive video frames. Based on the measured latencies, the time delays and the information about brightness levels, the controller determines a driving signal for a driver circuit for each illumination element. The driver circuit applies the determined driving signal to that illumination element to calibrate the OLED display.
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公开(公告)号：US10996514B1
公开(公告)日：2021-05-04
申请号：US16258184
申请日：2019-01-25
发明人： Evan M. Richards
IPC分类号： G02F1/13357 , G02B27/00 , G02F1/1335
摘要： A headset includes a backlight assembly, a display panel, and an optics block. The backlight assembly includes an array of light emitting diodes (LEDs), a diffusing element, and a brightness enhancement film. The array of LEDs and the brightness enhancement film are configured in a way such that the light generated by the backlight assembly has a non-uniform brightness distribution. The display panel receives the light and convert the light to image light. The image light has at least the non-uniform brightness distribution. The optics block includes one or more optical elements that direct the image light to an eyebox of the headset. The optics block adds another non-uniform brightness distribution to the image light to offset the non-uniform brightness distribution from the backlight assembly, such that the image light directed to the eyebox has a target brightness distribution.
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公开(公告)号：US10955688B1
公开(公告)日：2021-03-23
申请号：US17025638
申请日：2020-09-18
发明人： Evan M. Richards , Weihua Gao , Daozhi Wang
摘要： The disclosed method may include (1) providing, from a display, an image to an eye by way of a lens assembly on an optical path between the display and the eye, wherein the lens assembly includes (a) a first liquid crystal lens providing a first electronically controllable cylindrical power, oriented along a first constant axis, in response to a first signal and (b) a second liquid crystal lens providing a second electronically controllable cylindrical power, oriented along a second constant axis that is rotationally offset from the first constant axis, in response to a second signal, (2) determining, based on information indicating cylindrical power and cylindrical axis components, the electronically controllable cylindrical powers that result in providing the cylindrical power component, oriented along the cylindrical axis component, and (3) generating, based on the electronically controllable cylindrical powers, the signals. Various other systems and methods are also disclosed.
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公开(公告)号：US10678330B1
公开(公告)日：2020-06-09
申请号：US16541612
申请日：2019-08-15
发明人： Evan M. Richards , Jianru Shi , Fenglin Peng
摘要： A head mounted display system includes a display device and an eyetracking device. The display device includes a liquid crystal (LC) panel comprising a plurality of rows of pixels, a back light unit (BLU), and a data driver. The BLU emits light during an illumination period of a frame period from an illumination start time and does not emit light for a remaining portion of the frame period. The eyetracking device determines an eye gaze area of a user in a pixel area of the display device. The illumination start time varies based on a location of the eye gaze area of the user. Liquid crystal material in a row of pixels of the LC panel outside the eye gaze area of the user transitions during the illumination period.
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