Transflective liquid crystal display comprising a dielectric layer between the first and second electrodes in the transmissive region
First Claim
1. A display comprising:
- a plurality of normally dark pixel circuits each comprising;
a first electrode;
a second electrode;
a reflective region to reflect ambient light, the reflective region comprising a first portion of a liquid crystal layer between the first and second electrodes, and a polarization dependent reflector that transmits light having a first polarization and reflects light having a second polarization;
a transmissive region to transmit backlight, the transmissive region comprising a second portion of the liquid crystal layer between the first and second electrodes;
a dielectric layer between the first and second electrodes in the transmissive region, the dielectric layer configured such that when a pixel voltage is applied to the first and second electrodes, the percentage of the pixel voltage applied across the first portion of the liquid crystal layer is higher than the percentage of the pixel voltage applied across the second portion of the liquid crystal layer; and
a backlight module to generate the backlightwherein the dielectric layer and the polarization dependent reflector face the same side of the liquid crystal layer.
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Accused Products
Abstract
A display includes a plurality of pixel circuits, each pixel circuit including a first electrode, a second electrode, a reflective region, and a transmissive region. The reflective region reflects ambient light and includes a first portion of a liquid crystal layer and a polarization dependent reflector. The transmissive region transmits backlight and includes a second portion of the liquid crystal layer. A dielectric layer is between the first and second electrodes in one of the reflective region and the transmissive region, the dielectric layer configured such that when a pixel voltage is applied to the first and second electrodes, the percentage of the pixel voltage applied across the first portion of the liquid crystal layer is different from the percentage of the pixel voltage applied across the second portion of the liquid crystal layer. The display includes a backlight module to generate the backlight.
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Citations
19 Claims
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1. A display comprising:
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a plurality of normally dark pixel circuits each comprising; a first electrode; a second electrode; a reflective region to reflect ambient light, the reflective region comprising a first portion of a liquid crystal layer between the first and second electrodes, and a polarization dependent reflector that transmits light having a first polarization and reflects light having a second polarization; a transmissive region to transmit backlight, the transmissive region comprising a second portion of the liquid crystal layer between the first and second electrodes; a dielectric layer between the first and second electrodes in the transmissive region, the dielectric layer configured such that when a pixel voltage is applied to the first and second electrodes, the percentage of the pixel voltage applied across the first portion of the liquid crystal layer is higher than the percentage of the pixel voltage applied across the second portion of the liquid crystal layer; and a backlight module to generate the backlight wherein the dielectric layer and the polarization dependent reflector face the same side of the liquid crystal layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A display comprising:
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a first substrate; a second substrate; normally dark pixel circuits between the first and second substrates, each pixel circuit having a transmissive region and a reflective region, each pixel circuit comprising; a first electrode; a second electrode; a liquid crystal layer between the first and second electrodes, the liquid crystal layer having a first portion located at the reflective region and a second portion located at the transmissive region; a polarization dependent reflector located at the reflective region; and a dielectric layer located at the transmissive region, wherein the dielectric layer has an effective capacitance that is connected in series with an effective capacitance of the liquid crystal layer between the first and second electrodes, the dielectric layer is configured such that when a pixel voltage is applied to the first and second electrodes, the percentage of the pixel voltage applied across the first portion of the liquid crystal layer is higher than the percentage of the pixel voltage applied across the second portion of the liquid crystal layer; wherein the dielectric layer and the polarization dependent reflector face the same side of the liquid crystal layer. - View Dependent Claims (14, 15, 16)
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17. A transflective display comprising:
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a first linear polarizer having a first transmission axis; a second linear polarizer having a second transmission axis, the first linear polarizer located closer to a front side of the display than the second linear polarizer; normally dark pixel circuits each comprising; a first electrode; a second electrode; a liquid crystal layer between the first and second linear polarizers, the liquid crystal layer having a first portion between the first and second electrodes and a second portion between the first and second electrodes, the first portion corresponding to a reflective region of the pixel circuit, the second portion corresponding to a transmissive region of the pixel circuit; a storage capacitor to store an electric charge corresponding to a pixel voltage; a polarization dependent reflector that is associated with the first portion of the liquid crystal layer, the polarization dependent reflector to reflect a first component of external light and transmit a second component of the external light, the first component having a first polarization substantially perpendicular to the first transmission axis and the second component having a second polarization substantially parallel to the first transmission axis; and a dielectric layer disposed in the transmissive region of the pixel circuit, the dielectric layer configured between the first and second electrodes such that when the pixel voltage is applied to the first and second electrodes, the percentage of the pixel voltage applied across the first portion of the liquid crystal layer is higher than the percentage of the pixel voltage applied across the second portion of the liquid crystal layer; wherein the dielectric layer and the polarization dependent reflector face the same side of the liquid crystal layer. - View Dependent Claims (18, 19)
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Specification