Abstract:
Systems, methods, and devices for column inversion are provided. In one example, an electronic display may include a display panel having columns of pixels and display driver circuitry. The display driver circuitry may include source amplifiers and demultiplexers. Each demultiplexer may channel data output by at least one source amplifier to one of three columns of pixels. The display driver circuitry may drive the display panel according to a 3-column inversion scheme using one source amplifier per demultiplexer per frame of image data.
Abstract:
Devices and methods related to high-contrast liquid crystal displays (LCDs) are provided. For example, such an electronic device 10 may include an LCD 18 with two liquid crystal alignment layers 76, 82 not symmetric to one another and upper and lower polarizing layers 66, 68 respectively above and below the alignment layers 76, 82. Light transmittance through the plurality of pixels 42 may increase monotonically with gray scale voltage. The display 18 may operate using a gray scale level 0 voltage higher than a minimum gray scale level 0 voltage capability of the display. Additionally or alternatively, liquid crystal molecular alignment axes 110 of the two alignment layers 76, 82 may be offset from one another by an angle other than a multiple of 180 degrees. Additionally or alternatively, a first polarizing axis of the upper polarizing layer 66 or a second polarizing axis of the lower polarizing layer 68, or both, may be neither parallel nor perpendicular to one of the liquid crystal molecular alignment axes 110.
Abstract:
A liquid crystal display may have main column spacers and subspacer column spacers. The column spacers may have cross shapes formed from overlapping perpendicular rectangular column spacer portions respectively located on a color filter layer and a thin-film transistor layer. The column spacers may have a hybrid configuration in which some of the rectangular portions on the thin- film transistor layer extend vertically and some extend horizontally. Column spacers may be formed from planarization layer material, may be formed from locally thickened portions of a planarization layer, and may have circular shapes.
Abstract:
Liquid crystal display device (14) that has a color filter substrate (56) and a thin-film transistor substrate (58). A layer of liquid crystal material (52) is located between the color filter substrate (56) and the thin-film transistor substrate (58). Column spacers (122) are formed on the color filter substrate (56) to maintain a desired gap between the color filter substrate (56) and the thin-film transistor substrate (58). Support pads (130) used to support the column spacers (12) are formed on the thin-film transistor substrate (58). The column spacers (122) and support pads (130) have comparable thicknesses in order to avoid damage of surface layers of the substrates (56, 58) by scratching in case of misalignment between some of the column spacers (122) and support pads (130).
Abstract:
A display may have a layer of liquid crystal material between a color filter layer and a thin-film transistor layer. Column spacer structures may be formed between the color filter layer and the thin-film transistor layer to maintain a desired separation between the color filter and thin-film transistor layers. The column spacer structures may be formed from polymer structures such as photoresist pillars and may include metal pads. The metal pads may be formed on the upper surface of the thin-film transistor layer or the lower surface of the color filter layer. The photoresist pillars may be formed on a surface in the display such as the lower surface of the color filter layer. Column spacer structures may include main spacer structures, subspacer structures, and intermediate thickness spacer structures to enhance pooling mura and light leakage performance.
Abstract:
Methods and devices for shielding displays (18) from electrostatic discharge (ESD) are provided. In one example, a display (18) of an electronic device (10) may include a high resistivity shielding layer (78) configured to protect electrical components from static charges. The display (18) may also include a conductive layer electrically coupled to the high resistivity shielding layer (78) and configured to decrease a discharge time of static charges from the high resistivity shielding layer (78). The display (18) may include a grounding layer (72) and a conductor electrically coupled between the conductive layer and the grounding layer (72) to direct static charges from the conductive layer to the grounding layer (72).
Abstract:
Systems, methods, and devices for reducing the loss of transmittance caused by column inversion. To provide one example, an electronic display 18 may include a display panel 180 with columns of pixels 60 and driver circuitry 112 to drive the pixels 60 using column inversion. Adjacent columns 128 that are driven at like polarity are spaced more closely than adjacent columns 128 driven at opposite polarities.
Abstract:
An electronic device may have a liquid crystal display having a backlight and color mixing prevention structures. The color mixing prevention structures may, in part, be formed from one or more arrays of color filter elements. The liquid crystal display may include first and second transparent substrate layers on opposing sides of a liquid crystal layer. The display may include a first array of color filter elements on the first transparent substrate layer and a second array of color filter elements on the second transparent substrate layer. One or more of the arrays of color filter elements may include a black matrix formed over portions of the color filter elements. The color filter elements may fill or partially fill openings in the black matrix. The display may include a collimating layer on the second transparent substrate layer. The color filter elements may include cholesteric color filter elements.
Abstract:
Electrical shield line systems are provided for openings (829) between common electrodes (813, 815) near data lines (807) of display and touch screens (800). Some displays, including touch screens, can include multiple common electrodes (Vcom, 813, 815) that can have openings (829) between individual Vcoms (813, 815). Some display screens can have an open slit (829) between two adjacent edges of Vcom (813, 815). Openings (829) in Vcom (813, 815) can allow an electric field (831) to extend from a data line (807) through the Vcom layer (813, 815). A shield (833) can be disposed over the Vcom opening (829) to help reduce or eliminate an electric field from affecting a pixel material, such as liquid crystal (827). The shield (833) can be connected to a potential such that electric field is generated substantially between the shield (833) and the data line (807) to reduce or eliminate electric fields reaching the liquid crystal (827).