Patent application number | Description | Published |
20130128193 | Displays with Multilayer Masks and Color Filters - An electronic device may have a display such as a liquid crystal display. The display may have multiple layers of material such as a color filter layer and a thin-film transistor layer. An opaque masking layer may be formed on a display layer such as the color filter layer. In an inactive portion of the display, the opaque masking layer may form a rectangular ring that serves as a border region surrounding a rectangular active portion of the display. In the active portion of the display, the opaque masking layer may be patterned to from an opaque matrix that separates color filter elements in an array of color filter elements. The opaque masking layer and color filter elements may be formed from polymers such as photoresist. The opaque masking layer may include a black pigment such as carbon black. Color filter elements and opaque masking material may include multiple sublayers. | 05-23-2013 |
20130201429 | Display With Color Mixing Prevention Structures - 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. | 08-08-2013 |
20130265521 | Displays with Low Reflectance Border Regions - An electronic device may have a display such as a liquid crystal display. A color filter layer may be formed on a display layer such as a transparent substrate layer of the display. The color filter layer may include an array of color filter elements on an inner surface of the transparent substrate layer. The color filter layer may include opaque masking material. In an inactive portion of the display, the opaque masking material may be formed over the color filter elements and interposed between the color filter elements. In the inactive portion of the display, the opaque masking material and the color filter elements may form a ring that serves as a border region surrounding an active portion of the display. In the active portion of the display, the opaque masking layer may be patterned to from an opaque matrix that separates the color filter elements. | 10-10-2013 |
20130300978 | Display with Minimized Light Leakage - Displays such as liquid crystal displays may be provided with transparent substrates that minimize light leakage from the display. The transparent substrates may include a thin-film transistor substrate having thin-film transistors formed on a surface of the thin-film transistor substrate and a color filter substrate having color filter elements formed on a surface of the color filter substrate. The thin-film transistor substrate may be formed from a material having a relatively low photo-elastic constant. The color filter substrate may be formed from a material having a relatively low photo-elastic constant. Reduced birefringence effects in the thin-film transistor substrate and the color filter substrate may help minimize light leakage from the display when some or all of the display experiences internal or external stresses. | 11-14-2013 |
20140078448 | Stress Insensitive Liquid Crystal Display - A display is provided that has upper and lower polarizers, a color filter layer, a liquid crystal layer, and a thin-film transistor layer. The color filter layer and thin-film transistor layer may be formed from materials such as glass that are subject to stress-induced birefringence. To reduce light leakage that reduces display performance, one or more internal layers may be incorporated into the display to help ensure that linearly polarized backlight that passes through the display is not undesirably converted into elliptically polarized light. The internal layers may include a thin-film polarizer layer that forms a coating on the color filter layer, a thin-film polarizer layer that forms a coating on the thin-film-transistor layer, a retarder layer that is formed as a coating on the color filter layer, and a retarder layer that is formed as a coating on the thin-film-transistor layer. | 03-20-2014 |
20140078450 | Stress Insensitive Liquid Crystal Display - A display is provided that has upper and lower polarizers, a color filter layer, a liquid crystal layer, and a thin-film transistor layer. The color filter layer and thin-film transistor layer may be formed from materials such as glass that are subject to stress-induced birefringence. To reduce light leakage that reduces display performance, one or more internal layers may be incorporated into the display to help ensure that linearly polarized backlight that passes through the display is not undesirably converted into elliptically polarized light. The internal layers may include a thin-film polarizer layer that forms a coating on the color filter layer, a thin-film polarizer layer that forms a coating on the thin-film-transistor layer, a retarder layer that is formed as a coating on the color filter layer, and a retarder layer that is formed as a coating on the thin-film-transistor layer. | 03-20-2014 |
20140104527 | Process Architecture for Color Filter Array in Active Matrix Liquid Crystal Display - An active matrix liquid crystal display having an array of pixels is provided. The display includes a thin film transistor (TFT) for each pixel. The TFT has a gate electrode, a source electrode overlapping with a first area of the gate electrode, and a drain electrode overlapping with a second area with the gate electrode. The display also includes a color filter layer disposed over the TFT. The color filter layer has a first via hole to expose a portion of the drain electrode. The display further includes a metal layer disposed over the color filter layer and covering the gate electrode. The metal layer is configured to connect to the drain electrode through the first via hole. The display also includes an organic insulator layer disposed over the metal layer. The organic insulator layer has a second via hole to expose a first portion of the metal layer and a third via hole to expose a second portion of the metal layer. | 04-17-2014 |
20140118666 | Display with Column Spacer Structures Resistant to Lateral Movement - A display may have a color filter layer and a thin-film transistor layer. A layer of liquid crystal material may be located between the color filter layer and the thin-film transistor layer. Column spacers may be formed on the color filter layer to maintain a desired gap between the color filter and thin-film transistor layers. Support pads may be used to support the column spacers. Different column spacers may be located at different portions of the support pads to allow the support pad size to be reduced while ensuring adequate support. Lateral movement blocking structures such as circular rings may be used to prevent column spacer lateral movement. Subspacers located over pads may be used to create friction that retards lateral movement. Lateral movement may also be retarded by receiving column spacers in trenches or other recesses formed on a thin-film transistor layer. | 05-01-2014 |
20140152703 | Displays With Adjustable Circular Polarizers - An electronic device display may have an organic light-emitting diode layer that emits light to form images for a user. Reflective structures such as metal signal lines may be present in the organic light-emitting diode layer. Ambient light reflections from the metal signal lines may be suppressed using a circular polarizer on the organic light-emitting diode layer. To increase light emission efficiency from the organic light-emitting diode display layer under low ambient light conditions in which ambient light reflections are not significant, the polarization efficiency of the circular polarizer may be reduced. Control circuitry may make measurements of ambient light intensity using an ambient light sensor and can control the polarization efficiency of the circular polarizer accordingly by applying adjustable amounts of light or electric field. Polarization efficiency may also be adjusted using a photosensitive polarizer material that responds directly to changes in ambient light level. | 06-05-2014 |
20140327861 | Liquid Crystal Displays With Reduced Light Leakage - A display is provided that has upper and lower polarizers, a color filter layer, a liquid crystal layer, and a thin-film transistor layer. The color filter layer and thin-film transistor layer may be formed from materials such as glass that are subject to stress-induced birefringence. To reduce light leakage that reduces display performance, one or more birefringence compensation layers may be incorporated into the display to help compensate for any birefringence effects. The compensation layers may include a birefringence compensation layer attached to the color filter layer or the thin-film transistor layer. A display may include an upper compensation layer attached to the color filter layer and a lower compensation layer attached to the thin-film transistor layer. The compensation layer may be formed from glass or polymer materials that have a negative photo-elastic constant. | 11-06-2014 |