Patent application number | Description | Published |
20080252797 | METHOD FOR INPUT-SIGNAL TRANSFORMATION FOR RGBW DISPLAYS WITH VARIABLE W COLOR - A method for transforming three color-input signals (R, G, B) corresponding to three gamut-defining color primaries of a display to four color-output signals (R′, G′, B′, W) corresponding to the gamut-defining color primaries and one additional primary of the display, where the additional primary has color that varies with drive level, comprising: a) determining a relationship between drive level of the additional primary and intensities of the three gamut-defining primaries which together produce equivalent color over a range of drive levels for the additional primary; and b) employing the three color-input signals R, G, B and the relationship defined in a) to determine a value for W of the four color-output signals, and modification values to be applied to one or more of the R, G, B components of the three color-input signals to form the R′, G′, B′ values of the four color-output signals. | 10-16-2008 |
20080261478 | PATTERNING METHOD FOR LIGHT-EMITTING DEVICES - A method of forming a patterned, light-emitting device that includes providing a substrate, and mechanically locating a first masking film over the substrate. The first masking film is segmented into a first masking portion and one or more first contiguous opening portions in first locations. The first contiguous opening portions are mechanically removed. Subsequently, first light-emitting materials are deposited over the substrate in the first locations to form first light-emitting areas; and the first masking portion is mechanically removed. | 10-23-2008 |
20090130941 | DESICCANT SEALING ARRANGEMENT FOR OLED DEVICES - A method of encapsulating an OLED device includes forming an OLED device on a substrate; providing a protective cover surrounding the OLED device and the substrate; providing a first sealing arrangement between the protective cover and top surface of the substrate, to define a first chamber enclosing the OLED device; providing a second sealing arrangement sealed to define a second chamber sealed from and enclosing the first chamber; and providing first desiccant material in the first chamber and providing second desiccant material in the second chamber closer to the bottom surface of the substrate than the top surface. | 05-21-2009 |
20090295422 | COMPENSATION SCHEME FOR MULTI-COLOR ELECTROLUMINESCENT DISPLAY - A method of compensating for changes in the characteristics of transistors and electroluminescent devices in an electroluminescent display, includes: providing an electroluminescent display having a two-dimensional array of subpixels arranged forming each pixel having at least three subpixels of different colors, with each having an electroluminescent device and a drive transistor, wherein each electroluminescent device is driven by the corresponding drive transistor; providing in each pixel a readout circuit for one of the subpixels of a specific color having a first readout transistor and a second readout transistor connected in series; using the readout circuit to derive a correction signal based on the characteristics of at least one of the transistors in the specific color subpixel, or the electroluminescent device in the specific color subpixel, or both; and using the correction signal to adjust the drive signals. | 12-03-2009 |
20090322649 | TILED ELECTRONIC DISPLAY - A tiled display comprising: a plurality of display tiles aligned so that they provide the emissive image area; each display tile including: a plurality of light-emitting pixels arranged in groups of pixels; a plurality of sequentially arranged pixel drive circuits and each pixel drive circuit being electrically connected to a particular group of pixels for controlling the light emission of such pixels; one or more signal communication line(s) for providing data for controlling the operation of each pixel drive circuit; and each pixel drive circuit controlling the light emission of its corresponding group of pixels and providing information to the next sequential pixel drive circuit to cause such next sequential pixel drive circuit to respond to its corresponding data to control the operation of its group of light-emitting pixels and repeating this operation until a predetermined number of pixel drive circuits have caused the desired light emission. | 12-31-2009 |
20100039030 | OLED DEVICE WITH EMBEDDED CHIP DRIVING - An electroluminescent device having a plurality of current driven pixels arranged in rows and columns, such that when current is provided to a pixel it produces light, including each pixel having first and second electrodes and current responsive electroluminescent media disposed between the first and second electrodes; at least one chiplet having a thickness less than 20 micrometers; including transistor drive circuitry for controlling the operation of at least four pixels, the chiplet being mounted on a substrate and having connection pads; a planarization layer disposed over at least a portion of the chiplet; a first conductive layer over the planarization layer and connected to at least one of the connection pads; and a structure for providing electrical signals through the first conductive layer and at least one of the connection pads of the chiplet so that the transistor drive circuitry of the chiplet controls current to the four pixels. | 02-18-2010 |
20100039357 | DISPLAY DEVICE WITH CHIPLETS - A display device includes: a substrate; one or more pixels arranged on the substrate, each pixel including a control electrode; a wiring layer located over the substrate, the wiring layer having a continuous line and a discontinuous pass-thru line formed therein. The active-matrix device includes at least one chiplet located over the substrate and including first, second, third, and control connection pads including; a control line electrically connecting the control connection pad to the control electrode; a first end of the discontinuous pass-thru line connected to the first connection pad and a second end of the discontinuous pass-thru line connected to the second connection pad; circuitry electrically connecting the first and second connection pads; and the continuous line electrically connected to the third connection pad, wherein the continuous line extends to opposite sides of the chiplet. | 02-18-2010 |
20100073338 | INCREASING DYNAMIC RANGE OF DISPLAY OUTPUT - A method of controlling an RGBW electroluminescent display system that receives a three-component input image signal having triplets of intensity values in an image range and a highlight range includes transforming at least one of the triplets having an intensity value within the image range to a four-or-more-component drive signal to produce a luminance less than the sum of the corresponding luminance values of the red, green and blue light-emitting elements and transforming at least one of the intensity values within a triplet having an intensity value within the highlight range to a four-or-more-component drive signal to produce a luminance greater than the sum of the corresponding luminance values of the red, green, and blue light-emitting elements. | 03-25-2010 |
20100109166 | DEVICE WITH CHIPLETS AND ADAPTABLE INTERCONNECTIONS - An active-matrix device includes a device substrate including a plurality of pixels formed thereon, each pixel having a separate control electrode, a plurality of chiplets having at least first and second corresponding chiplets disposed at different locations over the device substrate, a plurality of wires formed over the device substrate, each wire being connected to a connection pad and to a different pixel control electrode, and wherein the shape of at least one of the wires connecting a connection pad for the first chiplet is different from the shape of at least one of the wires connecting a corresponding connection pad for the second chiplet. | 05-06-2010 |
20100123141 | EMISSIVE DEVICE WITH CHIPLETS - An emissive device includes a substrate having a substrate surface; a chiplet adhered to the substrate surface, the chiplet having one or more connection pads; a bottom electrode formed on the substrate surface, one or more organic or inorganic light-emitting layers formed over the bottom electrode, and a top electrode formed over the one or more organic or inorganic light-emitting layers; an electrical conductor including a transition layer formed over only a portion of the chiplet and only a portion of the substrate surface, the transition layer exposing at least one connection pad, the electrical conductor formed in electrical contact with the exposed connection pad and the bottom electrode; and an LED spaced from the chiplet and including a layer of light-emissive material formed over the bottom electrode and a top electrode formed over the light-emissive layer. | 05-20-2010 |
20100123384 | TILED OLED DEVICE WITH EDGE LIGHT EXTRACTION - An area-emissive light-emitting diode (LED) device comprises a substrate having an internal substrate surface, an external substrate surface opposite the internal substrate surface, and a substrate edge; an array of area-emissive LED pixels formed on the internal substrate surface with an edge gap between the substrate edge and the LED pixel on the internal substrate surface nearest the substrate edge; and a light-extraction structure formed in the edge gap and at least partially exterior to the LED pixels. | 05-20-2010 |
20100123649 | COMPENSATED DRIVE SIGNAL FOR ELECTROLUMINESCENT DISPLAY - Compensation is performed for initial nonuniformity or aging of drive transistors and electroluminescent (EL) emitters in 3T1C EL subpixels of an EL display, such as an organic light-emitting diode (OLED) display. A readout transistor connected to the EL emitter is used to readout the voltage of the emitter and compensation for ΔV | 05-20-2010 |
20100123694 | DISPLAY DEVICE WITH CHIPLETS AND HYBRID DRIVE - A display device having a hybrid drive including a substrate, a two-dimensional pixel array formed on the substrate, the pixels associated into a plurality of pixel groups. A separate set of group row electrodes and group column electrodes are connected to pixels in pixel groups, so that a single group row electrode together with a single group column electrode drives a single pixel. Two or more chiplets are located over the substrate within the pixel array, each chiplet associated with a pixel group and having connections to each of the associated group row electrodes and associated group column electrodes and having storage elements, the storage element storing a value representing a desired luminance for a pixel and the chiplet using such value to control the desired luminance of each pixel in its associated pixel group. | 05-20-2010 |
20100156766 | DIGITAL-DRIVE ELECTROLUMINESCENT DISPLAY WITH AGING COMPENSATION - An electroluminescent (EL) subpixel driven by a digital-drive scheme has a readout transistor driven by a current source when the drive transistor is non-conducting. This produces an emitter-voltage signal from which an aging signal representing the efficiency of the EL emitter can be computed. The aging signal is used to determine the loss in current of the subpixel when active, and an input signal is adjusted to provide increased on-time to compensate for voltage rise and efficiency loss of the EL emitter. Variations due to temperature can also be compensated for. | 06-24-2010 |
20100201275 | LIGHT SENSING IN DISPLAY DEVICE - A method for controlling an OLED display includes providing an OLED device and a controller, measuring and communicating the amount of ambient and emitted OLED light incident upon an array of photosensors distributed over the display area for measuring the incident light, operating the OLED pixels with at least one calibration image and forming an OLED compensation map in response to a first measured incident light, receiving a second incident light measurement and forming an ambient illumination map, receiving and compensating an image and driving the OLED pixels with the compensated image, receiving a third incident light measurement and forming large-area average values and small-area average values, and comparing the large-area average values and the small-area average values to a predetermined criterion, and determining the location of one or more light occlusions or reflections. | 08-12-2010 |
20100207851 | CHIPLET DRIVER PAIRS FOR TWO-DIMENSIONAL DISPLAY - A display device, including a substrate; a first layer having an array of row electrodes formed in rows across the substrate in a first direction and a second layer having an array of column electrodes formed in columns across the substrate in a second direction different from the first direction wherein the row and column electrodes overlap to form pixel locations; one or more layers of light-emitting material formed between the row and column electrodes to form a two-dimensional array of pixels, the pixels being located in the pixel locations; and a plurality of row driver chiplets and a separate plurality of column driver chiplets distributed relative to the two-dimensional array of pixels, each row driver chiplet exclusively connected to and controlling an independent set of row electrodes and each column driver chiplet exclusively connected to and controlling an independent set of column electrodes. | 08-19-2010 |
20100213819 | FLEXIBLE OLED DISPLAY WITH CHIPLETS - A flexible emissive display device having an adhesion layer thinner than the device substrate; a plurality of chiplets adhered to the adhesion layer wherein at least a portion of the adhesion layer extends above a portion of the chiplets; an OLED formed over the adhesion layer and wherein the OLED is thinner than the adhesion layer; a cover thicker than the adhesion layer located over the OLED and adhered to the device substrate; and wherein the chiplets and OLED are at or near the neutral stress plane of the device and the bending radius of the device is less than 2 cm. | 08-26-2010 |
20100225630 | ELECTROLUMINESCENT SUBPIXEL COMPENSATED DRIVE SIGNAL - An electroluminescent (EL) subpixel, such as an organic light-emitting diode (OLED) subpixel, is compensated for aging effects such as threshold voltage V | 09-09-2010 |
20100225634 | ELECTROLUMINESCENT DISPLAY COMPENSATED DRIVE SIGNAL - Subpixels on an electroluminescent (EL) display panel, such as an organic light-emitting diode (OLED) panel, are compensated for initial nonuniformity (“mura”) and for aging effects such as threshold voltage V | 09-09-2010 |
20100259166 | FLEXIBLE OLED DISPLAY WITH CHIPLETS - A flexible emissive device, includes a flexible rough substrate having a rough substrate surface and defining a display area; an organic low-temperature adhesion layer formed on the rough substrate surface, at least a portion of the organic low-temperature adhesion layer having a thickness greater than or equal to five microns; a plurality of chiplets distributed in the display area and adhering to the organic low-temperature adhesion layer, each chiplet having one or more connection pads; a plurality of patterned bottom electrodes formed over the organic low-temperature adhesion layer in the display area, each bottom electrode being electrically connected to only one connection pad of a corresponding chiplet; one or more layers of light-emitting material formed over the bottom electrode; and a top electrode formed over the one or more layers of light-emitting material; and a flexible encapsulating layer located over the top electrode and adhered to the rough substrate surface. | 10-14-2010 |
20100277064 | TILED ELECTROLUMINESCENT DEVICE WITH FILLED GAPS - A tiled electroluminescent device that improves light-emission uniformity and reduces reflection from ambient light includes a first and a second electroluminescent device tile, a portion of the edge of the first device tile abutted with a portion of the edge of the second device tile leaving a gap between the first and second device tile edges, each device tile including a substrate, having an optical index and a level of transparency, and an electroluminescent diode for emitting light according to a distribution that is substantially Lambertian, whereby light is directed along an oblique angle to the surface of the substrate of the first tile and through the edge of the first device tile; and a filler located in the gap between the abutting edges of the first and second device tiles, the filler having an optical index and a level of transparency matched to the substrates. | 11-04-2010 |
20100319847 | APPLYING CHIPLETS TO SUBSTRATES - A method of providing chiplets over a substrate including providing in sequence a substrate; coating an adhesive in a layer over the substrate; placing a plurality of first chiplets onto the adhesive layer in separated chiplet location(s) to adhere the first chiplets to the adhesive layer, wherein one or more of the first chiplets do not adhere to the adhesive layer, so that first chiplet(s) are adhered to the adhesive layer in adhered chiplet location(s) and first chiplet(s) are not adhered in non-adhered chiplet location(s); locally processing the adhesive layer in the non-adhered chiplet location(s) to condition the adhesive layer in the non-adhered locations to receive second chiplets; placing second chiplet(s) onto the adhesive layer in the conditioned non-adhered chiplet location(s) to adhere the second chiplets in the adhesive layer in the non-adhered locations; and curing the adhesive. | 12-23-2010 |
20110043105 | CONTROLLING AN ELECTRONIC DEVICE USING CHIPLETS - An electronic apparatus including a common substrate, a plurality of controlled electronic devices disposed over the common substrate, and a wiring layer having a plurality of conductors formed on the common substrate. A plurality of chiplets are located over the common substrate, each chiplet having an independent substrate separate from the common substrate, each independent substrate having a bottom side opposing a top side with one or more connection pads formed on the bottom side of the chiplet, and each chiplet including circuitry for controlling functions of one or more of the controlled electronic devices. The chiplets are adhered to the common substrate with the bottom side of the chiplet closer to the common substrate than the top side of the chiplet, and each connection pad is electrically connected to one of the plurality of conductors. | 02-24-2011 |
20110043499 | OPTICALLY TESTING CHIPLETS IN DISPLAY DEVICE - A method of making a display includes providing a display substrate having a plurality of control electrodes in a display area; locating a plurality of chiplets responsive to a controller to provide current to the control electrodes, each chiplet having a separate substrate, at least one pixel connection pad electrically connected to a control electrode, and one or more test light emitters formed in the chiplet responsive to the current provided on the control electrodes to emit light; controlling the chiplets to pass current through one or more of the test light emitters formed in the chiplet to emit light; detecting the light emitted by the test light emitters to determine faulty chiplets or chiplet interconnections; replacing or repairing the faulty chiplets or chiplet interconnections; and forming an organic light emitting diode over the substrate in the display area connected to the control electrodes. | 02-24-2011 |
20110050658 | CHIPLET DISPLAY WITH OPTICAL CONTROL - A display device having a display substrate defining an optical waveguide for transporting light carrying pixel information; a chiplet disposed over the display substrate, having a chiplet substrate separate from the display substrate, a photosensor responsive to light from the optical waveguide at the selected control wavelength for providing the pixel information, a selection circuit responsive to the pixel information for providing a control signal, and a drive circuit responsive to the control signal, wherein the chiplet is adapted to receive the transported light; an optical transmitter for transmitting the pixel information from the controller as light at the selected control wavelength into the optical waveguide, and a display optical element located in or over the display area responsive to the drive circuit for providing light. | 03-03-2011 |
20110057861 | TILED DISPLAY WITH OVERLAPPING FLEXIBLE SUBSTRATES - A tiled display apparatus includes at least five functionally identical transparent partially-overlapped display tiles arranged in two dimensions, each display tile including pixels arranged in a two-dimensional array, and the display tiles being disposed so that light emitted by pixels located beneath a neighboring display tile at the edge of the pixel array passes through the neighboring display tile. | 03-10-2011 |
20110102413 | ACTIVE MATRIX ELECTROLUMINESCENT DISPLAY WITH SEGMENTED ELECTRODE - An active-matrix electroluminescent display including a display substrate; a first electrode disposed over the display substrate; two second electrodes disposed over the first electrode; an electroluminescent light-emitting layer formed between and in electrical contact with the first and second electrodes, so that first and second active areas are defined where the first electrode and each respective second electrode overlap, the light-emitting layer emitting light from each active area in response to current between the first and each respective second electrode; a drive circuit including a drive transistor electrically connected to the first electrode for controlling the flow of current through the electroluminescent light-emitting layer; two power supply circuits connected to respective second electrodes for selectively providing respective voltages to the respective second electrodes; and a controller for sequentially or simultaneously causing the power supply circuits to provide the voltages to the respective second electrodes. | 05-05-2011 |
20110279014 | OLED DEVICE WITH EMBEDDED CHIP DRIVING - An electroluminescent device having a plurality of current driven pixels arranged in rows and columns, such that when current is provided to a pixel it produces light, including each pixel having first and second electrodes and current responsive electroluminescent media disposed between the first and second electrodes; at least one chiplet having a thickness less than 20 micrometers; including transistor drive circuitry for controlling the operation of at least four pixels, the chiplet being mounted on a substrate and having connection pads; a planarization layer disposed over at least a portion of the chiplet; a first conductive layer over the planarization layer and connected to at least one of the connection pads; and a structure for providing electrical signals through the first conductive layer and at least one of the connection pads of the chiplet so that the transistor drive circuitry of the chiplet controls current to the four pixels. | 11-17-2011 |
20120194564 | DISPLAY WITH SECURE DECOMPRESSION OF IMAGE SIGNALS - A display decompresses an image signal divided spatially into a plurality of algorithm blocks. The display substrate has a display area, and a cover affixed to the display substrate. A plurality of pixels is disposed between the display substrate and cover in the display area for providing light to a user in response to a drive signal. A plurality of control units is disposed between the display substrate and cover in the display area. Each is connected to one or more of the plurality of pixels. Each control unit receives an algorithm block and produce respective drive signal(s) for the connected pixel(s) by decompressing the data in the received algorithm block. | 08-02-2012 |
20120194565 | ELECTROLUMINESCENT DEVICE MULTILEVEL-DRIVE CHROMATICITY-SHIFT COMPENSATION - Compensation for chromaticity shift of an electroluminescent (EL) emitter having a luminance and a chromaticity that both correspond to current density is performed. Different black, first and second current densities are selected based on a received designated luminance and a selected chromaticity, each current density corresponding to emitted light colorimetrically distinct from the light emitted at the other two current densities. Respective percentages of a selected emission time are calculated for each current density to produce the designated luminance and selected chromaticity. The current densities are provided to the EL emitter for the calculated respective percentages of the emission time so that the integrated light output of the EL emitter during the selected emission time is colorimetrically indistinct from the designated luminance and selected chromaticity. | 08-02-2012 |
20120195426 | DISPLAY WITH SECURE DECRYPTION OF IMAGE SIGNALS - A display securely decrypts an encrypted image signal. Pixels are disposed between the display substrate and cover in a display area, and provide light to a user in response to a drive signal. Control chiplets disposed between the display substrate and cover in the display area are each connected to one or more of the plurality of pixels. Each receives a respective control signal and produce respective drive signal(s) for the connected pixel(s). A decryption chiplet is disposed between the display substrate and cover. It includes means for receiving the encrypted image signal and a decryptor for decrypting the encrypted image signal to produce a respective control signal for each of the control chiplets. | 08-02-2012 |
20120206421 | DIGITAL DISPLAY WITH INTEGRATED COMPUTING CIRCUIT - A digital display device includes a display substrate; an array of pixels formed on the display substrate; an array of driving circuits located on the display substrate, each driving circuit electrically connected to one or more pixels for controlling a pixel current provided to each pixel; an array of computing circuits located on the display substrate, each computing circuit including circuits for signal or image processing and for communicating with neighboring computing circuits; a plurality of electrical conductors formed on the display substrate and connected to each of the driving circuits and digital computing circuits, wherein each computing circuit is connected with an electrical conductor to each of its neighbors in the array of computing circuits; and means for providing an image signal connected to one or more of the electrical conductors. | 08-16-2012 |
20120212465 | ELECTROLUMINESCENT DISPLAY DEVICE WITH OPTICALLY COMMUNICATING CHIPLETS - An electroluminescent display includes a display substrate, a plurality of patterned first electrodes formed over the display substrate, one or more layers of light-emitting material formed over the plurality of first electrodes, at least one second electrode formed over the one or more layers of light-emitting material, and a plurality of chiplets. Each chiplet is electrically connected to a first electrode. Each chiplet further includes a light detector and a light emitter separate from the one-or-more layers of light-emitting material connected to the chiplet circuitry. The chiplet circuitry includes a modulating circuit for modulating light emitted by the light emitter and a demodulating circuit for demodulating light detected by the light detector so that light emitted by the light emitter of a first chiplet is received by the light detector of a second chiplet. | 08-23-2012 |
20120212515 | OLED Display with Reduced Power Consumption - Methods for displaying an image on a color display having a target display white point luminance and chromaticity, and including three gamut-defining emitters defining a display gamut and two or more additional emitters which emit light within the display gamut; the method including receiving a three-component input image signal; transforming the three-component input image signal to a five-or-more component drive signal; and providing the drive signal to display an image corresponding to the input image signal. One method provides a reproduced luminance value higher than the sum of the respective luminance values of the three components of the input signal when reproduced with the gamut-defining emitters. Another method provides reduced power in an OLED display including a white-emitting layer with three color filters for gamut-defining emitters and two or more additional color filters for three additional within-gamut emitters. | 08-23-2012 |
20120307123 | APPARATUS FOR DISPLAYING AND SENSING IMAGES - An apparatus for displaying and sensing images includes a display substrate and a plurality of electroluminescent pixels. A plurality of pixel control chiplets and one or more sensor chiplets are affixed to the device side of the display substrate in the display area. A transparent cover is spaced apart from and affixed to the device side of the display substrate, and has a plurality of imaging lenses formed on or in it, each imaging lens spaced apart from and corresponding to an image sensor array in a sensor chiplet for forming an imaging plane on the corresponding image sensor array. | 12-06-2012 |
20130249377 | OLED DISPLAY WITH REDUCED POWER CONSUMPTION - An OLED display with a plurality of pixels for displaying an image having a target display white point luminance and chromaticity, each pixel including three red, green and blue gamut-defining emitters defining a display gamut and a magenta emitter with two of cyan, yellow or white emitters as three additional emitters which emit light within the display gamut; the display including a means for receiving a three-component input image signal; transforming the three-component input image signal to a six component drive signal; and providing the drive signal to display an image corresponding to the input image signal. One embodiment is where the pixels have red, green, blue, cyan, magenta and yellow colored subpixels. | 09-26-2013 |
20140191200 | Apparatus and Method for Making OLED Lighting Device - An apparatus for depositing one or more organic material layers of an OLED lighting device upon a first region of a substrate and one or more conducting layers upon a second region, wherein the conducting layers partially or completely cover and extend beyond one side of the organic layers, comprising: a reusable mask in contact with the substrate, at least one mask open area having an overhang feature; one or more sources of vaporized organic material, selected to form layers of the OLED lighting device, and the vaporized organic material plume is shaped, on the side corresponding to the mask overhang feature, so as to limit substantial transfer of organic material on said side to angles less than or equal to a selected cutoff angle to the first region; and one or more sources of vaporized conducting material that transfer conducting material to the second region, wherein the second region partially or completely overlaps the first region and extends beyond the first region on the side corresponding to the overhang feature of the mask. | 07-10-2014 |
20140191201 | Apparatus and Method for Making OLED Lighting Device - An apparatus for depositing one or more organic material layers of an OLED lighting device upon a first region of a substrate and one or more conducting layers upon a second region, wherein the conducting layers partially or completely cover and extend beyond one side of the organic layers, comprising: a reusable mask in contact with the substrate, at least one mask open area having an overhang feature; one or more sources of vaporized organic material, selected to form layers of the OLED lighting device, and the vaporized organic material plume is shaped, on the side corresponding to the mask overhang feature, so as to limit substantial transfer of organic material on said side to angles less than or equal to a selected cutoff angle to the first region; and one or more sources of vaporized conducting material that transfer conducting material to the second region, wherein the second region partially or completely overlaps the first region and extends beyond the first region on the side corresponding to the overhang feature of the mask. | 07-10-2014 |