Abstract:
An electronic device may include a display having an array of organic light-emitting diode display pixels. The display pixels may have subpixels of different colors. The subpixels may include red subpixels, green subpixels, and blue subpixels. The subpixels may be provided with shapes and orientations that improve manufacturing tolerances. Subpixels such as green and red subpixels may have hexagonal shapes while blue subpixel structures may be provided with diamond shapes coupled in pairs to form barbell-shaped blue subpixels. Subpixels can also be angled at 45° relative to horizontal. Subpixels ma have shapes that overlap adjacent display pixels. For example, an array of display pixels that has been rotated by 45° relative to the edges of a display substrate may have blue subpixels and or red subpixels that are shared between pairs of adjacent display pixels in an at of display pixels.
Abstract:
An organic light-emitting diode (OLED) display may have an array of organic light-emitting diode pixels that each have OLED layers interposed between a cathode and an anode. Voltage may be applied to the anode of each pixel to control the magnitude of emitted light. The conductivity of the OLED layers may allow leakage current to pass between neighboring anodes in the display. To reduce leakage current and the accompanying cross-talk in a display, the pixel definition layer may disrupt continuity of the OLED layers. The pixel definition layer may have a steep sidewall, a sidewall with an undercut, or a sidewall surface with a plurality of curves to disrupt continuity of the OLED layers. A control gate that is coupled to a bias voltage and covered by gate dielectric may be used to form an organic thin-film transistor that shuts the leakage current channel between adjacent anodes on the display.
Abstract:
A display may have thin-film transistor circuitry that includes organic light-emitting diodes. The thin-film transistor circuitry may be formed on a substrate. First and second thin-film inorganic moisture barrier layers may be deposited on top of the thin-film transistor circuitry. An organic planarization layer may be interposed between the first and second thin-film inorganic moisture barrier layers. A moisture barrier glass layer may be attached to the second thin-film inorganic moisture barrier layer with a layer of liquid adhesive. The display may have functional layers such as a touch sensor and circular polarizer that are interposed between a cover glass layer and the moisture-barrier glass layer. A thermoplastic polymer moisture barrier ring that runs around the peripheral edge of the display may be laser welded between the moisture barrier glass layer and the substrate.
Abstract:
An organic light-emitting diode display may have an array of pixels with sets of pixels arranged in rows and columns. Each set of pixels includes a red pixel, a green pixel, a blue pixel, and a white pixel. The red pixels each have a white diode and a red color filter element to impart a red color to white light from that white diode. The green pixels each have a white diode and a green color filter element to impart a green color to white light from that white diode. The white pixels each have an unfiltered white diode. The blue pixels each have an unfiltered blue diode. The unfiltered white and blue diodes do not have color filters and emit white and blue light for the white and blue pixels, respectively. The white and blue diodes may be tandem diodes having two or more emissive layers.
Abstract:
An electronic device may include a display having an array of organic light-emitting diode display pixels including red, green, and blue pixels. Anodes in the pixels of each color may have a variable pitch along a first dimension on a display substrate and a constant pitch along a second dimension on the display substrate that is orthogonal to the first dimension. Anodes in a row of red pixels may have a variable pitch along the row. anodes in a row of green pixels may have a variable pitch along the row, and anodes in a row of blue pixels may have a variable pitch along the row. The anodes of each different color of pixel may have constant pitches along columns of the array.
Abstract:
An evaporation tool is provided that has an elongated evaporation source with elongated edges that run parallel to a longitudinal axis and shorter edges that run perpendicular to the longitudinal axis. The evaporation source has multiple evaporation sources formed by respective source orifices through which material is evaporated. An evaporation control structure is mounted to the evaporation source to enhance the directionality of evaporated material. A shadow mask is provided that has a rectangular frame for supporting a metal mask layer with a pattern of openings. The evaporation control structure ensures that the evaporated material from the source is evaporated towards the shadow mask. Angled walls attached to the elongated edges, a series of vertical walls that extend between the angled walls in the evaporation control structure, and aligned vertical wall extensions on the frame of the shadow mask are used to block evaporated material following angled trajectories.
Abstract:
A display may have thin-film transistor circuitry that includes organic light-emitting diodes. The thin-film transistor circuitry may be formed on a substrate. First and second thin-film inorganic moisture barrier layers may be deposited on top of the thin-film transistor circuitry. An organic planarization layer may be interposed between the first and second thin-film inorganic moisture barrier layers. A moisture barrier glass layer may be attached to the second thin-film inorganic moisture barrier layer with a layer of liquid adhesive. The display may have functional layers such as a touch sensor and circular polarizer that are interposed between a cover glass layer and the moisture-barrier glass layer. A thermoplastic polymer moisture barrier ring that runs around the peripheral edge of the display may be laser welded between the moisture barrier glass layer and the substrate.