# US 9,519,164 B2 · Systems and methods for mura calibration preparation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,519,164 B2 - Document ID: US9519164B2 - Status: Granted - Kind: B2 - Application number: 13/601,529 - Filed: 2012-08-31 - Published: 2013-12-12 - Granted: 2016-12-13 - Earliest claimed: 2012-06-08 - Assignees: Apple Inc. - Applicants: Ahmad Al-Dahle; David A. Stronks; Hopil Bae - Inventors: Ahmad Al-Dahle; David A. Stronks; Hopil Bae - Web page: https://patentgrep.com/patent/US9519164B2 ## CPC - G02F 1/1309: {Repairing; Testing} - G02F 1/13338: {Input devices, e.g. touch panels} - G02F 1/136204: {Arrangements to prevent high voltage or static electricity failures} - G09G 2320/0693: Calibration of display systems - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract Systems and methods for calibrating an electronic display to reduce or eliminate artifacts are provided. One method for reducing or eliminating artifacts may involve baking the operational—but not yet fully calibrated—electronic display to reduce stray charge on the electronic display. After baking the display, the electronic display may be calibrated to reduce or eliminate flicker and/or mura artifacts ## Claims ### Claim 1 A method for manufacturing an electronic display comprising: baking the electronic display to reduce stray charge on the electronic display comprising a liquid crystal display, wherein: reducing the stray charge reduces bias voltages accumulated in the liquid crystal display, wherein reducing the bias voltages reduces a mura artifact or a flicker of the liquid crystal display; the liquid crystal display comprises a plurality of distinct common voltage layers (VCOMs), wherein each VCOM provides a common electrode for a plurality of pixels, wherein each pixel comprises a respective pixel electrode, wherein each pixel is configured to be activated by at least one of a plurality of gate lines; and the electronic display is configured to be sufficiently operational so as to be capable of being calibrated to reduce the mura artifact or the flicker of the liquid crystal display; and calibrating the electronic display to reduce the mura artifact or the flicker of the liquid crystal display after baking the display. ### Claim 2 (depends on 1) The method of claim 1, wherein calibrating the electronic display comprises tuning the electronic display to reduce or eliminate the mura artifact that is a result of voltage differences between the plurality of distinct VCOMs. ### Claim 3 (depends on 1) The method of claim 1, wherein calibrating the electronic display comprises tuning the electronic display to reduce or eliminate the flicker. ### Claim 4 (depends on 3) The method of claim 3, wherein the electronic display is tuned to reduce or eliminate the flicker while the plurality of pixels of the liquid crystal display are programmed to display a gray level configured to produce a stronger contrast of the mura artifact than most other gray levels on a scale from G0 to G255. ### Claim 5 (depends on 3) The method of claim 3, wherein the electronic display is tuned to reduce or eliminate the flicker while the plurality of pixels of the liquid crystal display are programmed to display a gray level of between G40 to G80 on a scale from G0 to G255. ### Claim 6 (depends on 3) The method of claim 3, wherein the electronic display is tuned to reduce or eliminate the flicker while the plurality of pixels of the liquid crystal display are programmed to display a gray level configured to produce a stronger contrast of the mura artifact than all other gray levels on a scale from G0 to G255. ### Claim 7 (depends on 3) The method of claim 3, wherein the electronic display is tuned to reduce or eliminate the flicker while the plurality of pixels of the liquid crystal display are programmed to display a gray level of G63 on a scale from G0 to G255. ### Claim 8 A method for manufacturing an electronic display, comprising: providing a liquid crystal display, wherein the liquid crystal display comprises a plurality of distinct common voltage layers (VCOMs) configured to cause a mura artifact to appear on the liquid crystal display when the liquid crystal display is operated, wherein each VCOM provides a common electrode for a plurality of pixels, wherein each pixel comprises a respective pixel electrode, wherein each pixel is configured to be activated by at least one of a plurality of gate lines; baking the liquid crystal display to reduce stray charge, wherein reducing the stray charge reduces bias voltages accumulated in the liquid crystal display, wherein reducing the bias voltages reduces the mura artifact or a flicker of the liquid crystal display; and calibrating an operating parameter of the liquid crystal display to reduce or eliminate the mura artifact after the stray charge has been reduced due to baking. ### Claim 9 (depends on 8) The method of claim 8, wherein the method is performed before the liquid crystal display is installed into a host electronic device. ### Claim 10 (depends on 8) The method of claim 8, wherein the method is performed while the liquid crystal display is installed in a host electronic device. ### Claim 11 (depends on 8) The method of claim 8, wherein the liquid crystal display is baked at a temperature of between 40 and 60 degrees Celsius. ### Claim 12 (depends on 8) The method of claim 8, wherein the liquid crystal display is baked for a period of time configured to cause substantially all stray charge on the liquid crystal display due to prior manufacturing steps to become dissipated. ### Claim 13 (depends on 8) The method of claim 8, wherein the liquid crystal display is baked at a humidity higher than typically employed during liquid crystal display manufacturing. ### Claim 14 (depends on 8) The method of claim 8, wherein the liquid crystal display is baked at a humidity of between 40 and 60 percent. ### Claim 15 (depends on 8) The method of claim 8, wherein the liquid crystal display is baked a humidity higher than prior manufacturing steps to prevent electrostatic discharge from damaging the liquid crystal display. ### Claim 16 A method for manufacturing an electronic device, comprising: installing an electronic display into the electronic device, wherein stray charge accumulates on components of the electronic display during installation, wherein the electronic display comprises a liquid crystal display, wherein the liquid crystal display comprises a plurality of distinct common voltage layers (VCOMs), wherein each VCOM provides a common electrode for a plurality of pixels, wherein each pixel comprises a respective pixel electrode, wherein each pixel is configured to be activated by at least one of a plurality of gate lines; baking the electronic device to cause the stray charge to dissipate from the components of the electronic display, wherein causing the stray charge dissipate from the components of the electronic display reduces bias voltages accumulated in the liquid crystal display, wherein reducing the bias voltages reduces a mura artifact or a flicker of the liquid crystal display; and calibrating the electronic display while the stray charge is dissipated. ### Claim 17 (depends on 16) The method of claim 16, wherein calibrating the electronic display comprises: tuning the electronic display to reduce or eliminate the flicker while the electronic display is programmed to display a gray level that produces a stronger contrast of the mura artifact than most other gray levels on a scale from G0 to G255; and tuning the electronic display to reduce or eliminate the mura artifact. ### Claim 18 (depends on 16) The method of claim 16, wherein the electronic device comprises a handheld device, a portable phone, a notebook computer, a tablet computer, or a desktop computer, or any combination thereof.